7.) Solve the proportion x/8=30/40?

x=4
x=2
x=3
x=6

To solve the proportion x/8 = 30/40, we can cross multiply:

x * 40 = 8 * 30

40x = 240

Dividing both sides by 40:

x = 6

Therefore, x = 6 is the solution to the proportion.