Question

4/5 = 28/??? (Simple Answer)

Answer 1

4/5 = 28/x

You need to multiply 4 by how many times to get 28?

4.y = 28

y = 28/4

y = 7

So, you need to multiply 5 by 7 to know x.

x = 5.7

x = 35

4/5 = 28/35

Answer 2

If $\frac{4}{5}$ = $\frac{28}{x}$, we need to find out what form of one we have to multiply one fraction to get the other fraction. Since we only have the numerator of both fractions, we need to divide each of the numerators to find out what we need to multiply the denominator we know to get x. We can do this because multiplying by a form of one (e.g. 3/3) doesn't change the value of a fraction or expression. 28/4 is 7, so we have to multiply the denominator 5 by 7. Since 7 * 5 is 35, $\frac{4}{5}$ = $\frac{28}{35}$