Solve the following proportion for the unknown variable: 15/d = 24/40

d = 25

Explanation:
To get the value of d, we will need to isolate the d on one side of the equation.

This can be done as follows:


First, we will do cross multiplication as follows:
40*15 = 24*d
600 = 24d

Then, we will isolate the d as follows:
24d = 600


d = 25

Hope this helps :)