2 * 2 * 2 * 3 * 3 * x * y
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Inverse proportion implies xy = c where c is the constant of [inverse] proportionality. x = 2 and y = 36 implies xy = 72 = c So the relationship is xy = 72 Then, if x = 4, y = 72/x = 72/4 = 18
Apart from 1, all of the other factors of 72 are multiples of prime factors.
The prime factors for 72 are: 2, 3
1*72 = 72
72 x 1 = 72