Proportion Calculator
Enter three of the four values in a proportion (a/b = c/d) and this calculator will solve for the missing one. Leave the unknown value as 0.
Inputs
Set the unknown to 0
Results
Solved for C
15
Equation
3/4 = 15.0000/20
Cross Product (a x d)
60
Cross Product (b x c)
60
Proportional?
Yes