Question

How do you solve the proportion `5/x=10/4`?

Answer 1

`x=2`

Explanation:

This can be solved using cross multiplication. This fraction equation is the same as the following:

`x xx 10=5xx4`

`x xx 10 = 20`

Divide both sides by `10`

`x xx cancel(10)/cancel(10) = 20/10`

`x = 2`

Answer 2

`x=2`

Explanation:

When you have proportions (two fractions equal to each other), cross multiply:
Left Numerator x Right Denominator = Right Numerator x Left Denominator
`5/x=10/4`
`5*4=10*x`

Solve:
`5*4=10*x`
`20=10x`
`x=2`