Inverse Cross Multiplication

Calculator and formulas for calculating the inverse cross multiplication

Inverse cross multiplication calculator


Inverse cross multiplication is a method of elementary arithmetic to calculate the value of a variable in an equation involving two multiplications or rational expressions (not to be confused with inverse cross product).


To perform the calculation, enter three values, then click on the 'Calculate' button.


Inverse cross multiplication

 Variable a   Variable b
=
 Variable c   Result x
Decimal places

Formula and Example

The formula for the reverse cross multiplication consists of two pairs of values, the multiplication gives the same value.

formula for reverse cross multiplication

The formula is changed for the calculation:

formula for reverse cross multiplication

Example

If 4 workers complete a job in 20 hours, how long does it take 5 workers?
formula for reverse cross multiplication
formula for reverse cross multiplication
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