Cross multiplication

Cross multiplication is a method of elementary arithmetic to calculate the value of a variable in an equation involving two fractions or rational expressions (Not to be confused with Cross product).

To perform the calculation, enter the values of the varibles, then click the 'Calculate' button.

Formula and example

The formula for the cross multiplication consists of two pairs of values that are related to each other.

or

The formula is changed for the calculation:

Example

or