wikiHow Cross Multiplication Calculator Cross-multiplication is a method used to solve equations that involve two fractions. The formula for cross-multiplication is: a/b = c/d => ad = bc This means that the product of the numerator of the first fraction and the denominator of the second fraction must be equal to the product of the numerator of the second fraction and the denominator of the first fraction. To use the cross-multiplication calculator, you'll need to input the values of the two fractions in the form of a/b = c/d, and the calculator will calculate the result of the cross-multiplication for you. For example, let's say you have the equation 2/3 = x/6. To solve for x using cross-multiplication, you would multiply the numerator of the first fraction (2) by the denominator of the second fraction (6) and set it equal to the product of the numerator of the second fraction (x) and the denominator of the first fraction (3): 2/3 = x/6 2 x 6 = 3 x x 12 = 3x x = 4 So the solution for x is 4. Page