Proportions: Easy Rule-of-3

Simplest Rule of 3
Proportions calculator

Calculate proportions: Cross-multiply fractions, easily, with this simple Android app!

  • Enter three numbers into the two fractions.
  • Leave empty the number you are looking for.
  • Get your results as you type:
    • as a sentence
    • as a solved equation

I have provided translations for multiple languages. You can use the app in your phone’s native language.

If you spot any translation errors in your language, please email me. I will try to fix it.

There is a small banner ad near the bottom of the screen. Your work will not be interrupted with other annoying ads.

Get it on Google Play

Screenshots

Changelog

1.0.1

  • Add: Feedback from unsatisfied users is now stored in Cloud Firestore for later inspection.

1.0.0

  • Calculate proportions using the Rule-of-Three.
  • Displays solution as well as how to calculate it.
  • Displays a sentence that describes the proportions in clear terms.
  • UI is translated to many languages and locales.
  • Feature to easily share the app with friends.
  • In-app review nag with sentiment gating.
  • Only one small unobtrusive banner ad at the bottom of the screen. No interstitial ads whatsoever.
  • For European Economic Area users, option to turn off targeted banner ads.

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