How to solve 4/9=28/x in two methods

Proportion:

a/b = c/d

where: cross products are equal.

ad = bc

a/b = c/d

a = 4 4/9 = 28/x

b = 9 cross products

c = 28 ad = bc

d = x 4x = 9*28

4x = 252

4x/4 = 252/4

x = 63

4/9 = 28/x

4/9 = 28/63

4/9 is the simplified factor of 28/63.

28 : 7 = 4

63 : 7 = 9

Another solution for this is.

4/9 = 28/x

x is a denominator, we need to eliminate it. To do so, we must make x the numerator. so we multiply both side with x.

4/9 * x/1 = 28/x * x/1

4x/9 = 28

4x/9 * 9/1 = 28 * 9/1 * eliminate the denominator 9 by multiplying both sides with numerator 9.

4x = 252

4x/4 = 252/4

x = 63