Solve a rule of three direct or inverse using a mobile phone or tablet.
RULE OF THREE CALCULATOR
Calculator with an easy and simple interface to solve a rule of three direct or inverse using a mobile phone or tablet.
A switch allows to change between DIRECT and INVERSE proportions.
You must enter three values and leave another one to zero.
Is not necessary that the unknown be the fourth value, can be any of the them. The mobile device will take as unknown the value equal to zero.