Explanation:
To find the constant of proportionality between x and y, we need to use the formula:
constant of proportionality = y / x
Given that x = 72 and y = 32, we can substitute these values into the formula:
constant of proportionality = 32 / 72
Simplifying the expression:
constant of proportionality = 4 / 9
Therefore, the constant of proportionality between x and y is 4/9.