Rule of three calculator
Solve a direct rule of three: A is to B as C is to X.
A : B = C : X
How it works
Enter the three known values in A : B = C : X to calculate X automatically.
Formula
X = (B × C) / A
Example
If 2 : 5 = 4 : X, then X = 10.
Solve a direct rule of three: A is to B as C is to X.
A : B = C : X
Enter the three known values in A : B = C : X to calculate X automatically.
X = (B × C) / A
If 2 : 5 = 4 : X, then X = 10.