# ProportionsOf ? — Rule of Three Solver

> Rule of Three Solver (iPhone/iPad app by Claudio Guirunas.)

- Source: https://appshunter.io/ios/app/proportionsof/id1151235927 (this page in markdown: same URL + `.md`)
- Developer: [Claudio Guirunas](https://appshunter.io/developer/1149103410)
- Category: Developer Tools, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 11 MB
- Languages: American English, Arabic, Bangla, Dutch, French (France), German (Germany), Greek, Hebrew, Hindi, Irish and 11 more
- Released: 2016-09-16
- Data updated: 2026-08-28
- User reviews in markdown: https://appshunter.io/ios/app/proportionsof/id1151235927/reviews.md

## What is ProportionsOf ??

Cross-multiplication or Means-Extremes Property of Proportions:

In maths we say: The product of the means is equal to the product of the extremes:
∴ x:z = y:w => x.w = z.y

This APP uses the Rule of Three to calculates the ratio between values.

For example, you can calculate whether it's worth buying a promotional product like this one:

"Buy 70gr of biscuit for €4.98 or 140gr for € 9.97".

Would not it be more advantageous to buy 2 of 70g instead of 1 package of 140g?
Well, you can draw your own conclusions using the app for a multitude of calculations.

Basically, the entire world around your is a matters of proportions.

The App also a great tool for children to get a notion of how they can  calculate proportions using the rule of three to start to use on their daily-life.

Available in Arabic, Bengali, Chinese, Dutch, English, French, German, Greek, Hebrew, Hindi, Irish, Italian, Japanese, Korean, Malay, Persian, Portuguese, Russian, Spanish, Turkish and Ukrainian.

∙ Terms & Conditions of Use: https://proportionsof.398031.xyz/legal.php?doc=term_and_conditions&l=en
∙ Privacy Policy: https://proportionsof.398031.xyz/legal.php?doc=privacypolicy&l=en
∙ Disclaimer: https://proportionsof.398031.xyz/legal.php?doc=disclaimer&l=en

For more information, please visit the website: https://proportionsof.398031.xyz/?l=en


## Version history (last 5 releases)

### 1.4 — 2026-08-25

- Links updated
- Google Ads removed;
- Removed data collection;

### 1.3 — 2024-04-18

Removed the Interstitial Google Ads

### 1.2 — 2023-10-28

- User Interface improvements;
- Bug fixes;
- Ads less-annoying;

### 1.1 — 2023-04-01

-User Interface improved;
- Rewritten in SwiftUI;
- Bug fixes;

### 1.0 — 2016-09-07

This app has been updated by Apple to display the Apple Watch app icon.

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## More apps by Claudio Guirunas

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All apps by Claudio Guirunas: https://appshunter.io/developer/1149103410

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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 2026-08-28.*