What value of x makes this proportion true 3/x=15/40

3/x=15/40

solve for x

multiply both sides by x

3=15x/40

multiply both sides by 40

120=15x

dvide both sdies by 15

8=x

the answer is 8

or you could simplifyy 15/40 to get 3/8

If you would like to solve the equation 3 / x = 15 / 40 for x, you can calculate this using the following steps:

3 / x = 15 / 40 / * x

3 = 15 / 40 * x / * 40

3 * 40 = 15 * x / 15

x = 3 * 40 / 15

x = 8

The correct result would be 8.