Question

Solve for x.
12:15=x:5

Answer 1

Set up the ratios as proportional fractions:


`(12)/(15) = (x)/(5)`

We can simplify the first fraction to make the problem easier. Both the numerator and denominator of the first fraction can be divided by 3:


`(12)/(15) / (3)/(3) = (4)/(5)`

`(4)/(5) = (x)/(5)`

Both fractions now have the same denominator. Since both fractions have to equal each other, the numerators will also be the same. Therefore, x = 4.