Regra de Três
Resolve proporções com multiplicação cruzada.
Como usar Regra de Três
- 1Enter the three known values (A, B, C)
- 2The calculator finds D = (B × C) / A
- 3Use this for unit conversions, recipe scaling, and proportional problems
Sobre Regra de Três
The Rule of Three Calculator solves proportional reasoning problems. If A is to B as C is to D, enter any three values and it finds the fourth. Also known as cross multiplication, this is fundamental for unit conversions, scaling recipes, and everyday proportion problems.
Perguntas frequentes
What is the rule of three?
The rule of three (or cross multiplication) finds an unknown value when three values of a proportion are known: D = (B × C) / A.