An application for calculating the rule of three.
The rule of three is a method of cross-multiplication used to solve problems involving proportionality between three known values and one unknown.
For an equation in the form:
where the variable to be evaluated is in the right-hand denominator, the Rule of Three states that:
In this context, a is referred to as the extreme of the proportion, and b and c are called the means.
Source: Wikipedia Cross-multiplication
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