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

2 Answers
Jun 17, 2017

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

Jun 17, 2017

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