Question

Fill in the blank to make the two fractions equivalent.

5 / 7 = x / 21

Type your numerical answer below.

Answer 1

`x=15`

Explanation:

we have

`(5)/(7)=(x)/(21)`

solve for x

That means ---> isolate the variable x

Multiply in cross

`5(21)=x(7)`

`105=7x`

Divide by 7 both sides

`105/7=7x/7`

`15=x`

Rewrite

`x=15`