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.

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