Inverse Cross Multiplication
Calculator and formulas for calculating the inverse cross multiplication
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.
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Formula and Example
The formula for the reverse cross multiplication consists of two pairs of values, the multiplication gives the same value.
\(\displaystyle a· b=c· x\)
The formula is changed for the calculation:
\(\displaystyle x=\frac{a ·b}{c}\)
Example
If 4 workers complete a job in 20 hours, how long does it take 5 workers?
\(\displaystyle 4 · 20=5 · x\)
\(\displaystyle x=\frac{4 ·20}{5} = 16 \;hrs.\)
Absolute Change
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All divisors of an integer
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Average
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Binomial formulas
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Common divisors of two integers
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Consecutive integers
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Cross multiplication
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Diamond problem
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Digit sum
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Digital root
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Direct variation
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Division with remainder
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Elementary arithmetic
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Factorial
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FOIL Method
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Inverse cross multiplication
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Inverse modulo
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Greatest common divisor
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Least common multiple
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Modulo
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Multiplicative inverse
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Relative Change
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