# Rule of Proportion PRO — With solution steps

> App for solving proportion problems with detailed steps and history. (iPhone/iPad app by Glindemann, Sennoun, Langer GbR.)

- Source: https://appshunter.io/ios/app/rule-of-proportion-pro/id1497341819 (this page in markdown: same URL + `.md`)
- Developer: [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809)
- Category: Education, Utilities
- Price: $1.99
- Rating: 5.00/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 179 MB
- Languages: American English, French (France), German (Germany), Hindi, Indonesian, Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China) and 1 more
- Released: 2020-02-01
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rule-of-proportion-pro/id1497341819/reviews.md

## What is Rule of Proportion PRO?

Proportions are no problem anymore. For this, only 3 of 4 variables must be entered. All calculations are stored in the history. The final solution can be shared.

[ Content ]
- the variables must be entered
- calculation with the rule of proportion
- history function that saves input
- detailed solution
- the entering of fractions and decimals is supported
- constants can be entered
- no ads!

[ Usage ]
- there are 4 fields for entering the values ​​using a modified keyboard
- if you have entered wrong values or values are missing, the text fields are highlighted
- you can switch between the solution, input view and history by swiping and / or touching the buttons
- the entries in the history can be deleted or sorted manually
- if you select an entry in the history, it will be loaded automatically for the calculation
- the entire history can be deleted by pressing a key

## Key features

- Enter 3 of 4 variables
- Detailed solution steps
- Calculation history
- Supports fractions and decimals
- Highlights incorrect entries
- Share final solutions

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/rule-of-proportion-pro/id1497341819/reviews.md

### 2/5 — Der dritte Werbungs-Screenshot erweckt den Eindruck...

*2020-04-23*

... diese App könnte viel mehr.

Habe nur gekauft, weil ich mehr vermutete!
„Reingelegt worden“ - nenne ich sowas!

**Developer response:** Hallo!

Tut mir leid, dass es ein solches Missverständnis gab. Für einige Nutzer ist das Menü mit den Verlinkungen zu den anderen Mathe-Problemlösern eine komfortable Möglichkeit, zwischen ihnen zu wechseln.

Aber Sie haben ja die Möglichkeit, Apps zurück zu geben. https://www.macwelt.de/news/Apps-zurueckgeben-stornieren-8307463.html

Es bringt uns als Entwickler nichts, wenn aus einem Missverständnis heraus 1-2€ generiert werden und dem Nutzer die App nichts bringt. Daher machen Sie gern von der Rückgabe Gebrauch.

Falls nicht, bedanke ich mich recht herzlich bei Ihnen für Ihre Unterstützung!

Um solche Probleme zu vermeiden, bieten wir parallel zu den kostenpflichtigen Versionen noch kostenfreie Versionen zum Testen an. Da können Sie sich bei anderen Apps einen Eindruck verschaffen, ob sie Ihren Anforderungen entspricht.

Freundliche Grüße

## Frequently asked questions about Rule of Proportion PRO

### How does Rule of Proportion PRO work?

Rule of Proportion PRO allows you to enter three of the four variables in a proportion problem. The app then calculates the missing variable and provides detailed, step-by-step solutions. It supports both fractions and decimals for input.

### Does Rule of Proportion PRO have ads?

No, Rule of Proportion PRO is ad-free. Users can enjoy a distraction-free experience while solving their proportion problems.

### What devices is Rule of Proportion PRO compatible with?

Rule of Proportion PRO is available for iPhone, iPad, and iPod. It is designed to run on iOS devices.

### How is the history function in Rule of Proportion PRO useful?

The history function saves all your past calculations, allowing you to easily revisit and load them for further use. You can also delete or manually sort entries in the history.

### What is the age rating for Rule of Proportion PRO?

Rule of Proportion PRO has an age rating of 4+. This indicates it is suitable for children aged 4 and above.

### How often is Rule of Proportion PRO updated?

The latest version of Rule of Proportion PRO is 2.1.8, last updated on May 1, 2026. The app is actively maintained.

### What is the price of Rule of Proportion PRO?

Rule of Proportion PRO is a paid application priced at $1.99. This one-time purchase grants access to all its features.

### Can I share my calculation results from Rule of Proportion PRO?

Yes, the app allows you to share the final solution of your proportion calculations. This is useful for students or professionals who need to present their work.

## Version history (last 5 releases)

### 2.2.3 — 2026-08-14

The latest release 'Least common multiple' is linked in the menu section now.

Minor performance and UI fixes.

### 2.2.2 — 2026-08-04

- the status bar on top is integrated into the current app design
- the app flow was improved (pop-up information was balanced)

### 2.2.1 — 2026-07-17

Maintenance update. Improving performance.

### 2.2.0 — 2026-06-19

Bringing all apps to the same security standard. Critical storage behaviour for solutions has been fixed.

By the way - I run many apps with different math topics. If you like this one: Check them out as well!

I always do my best to keep a high standard on my apps. If something does not meet the expectations, do not hesitate to contact me.

### 2.1.9 — 2026-06-06

There were some major fixes and adjustments for a more stable behaviour of the solution storage and loading. Therefore some database changes were made in the background. There are no performance losses and the functionality does not change. The background tasks are only done once within milliseconds. Following behaviour may occur (only temporary):
- stored calculations have to be tapped twice to load fully
- the order of the stored solutions may change

If there are some losses of solutions do not hesitate to contact me and tell me the number of lost solutions + affected app. I will find a solution for this.

Kind regards, Alex (the Dev)

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All apps by Glindemann, Sennoun, Langer GbR: https://appshunter.io/developer/1024972809

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*