Solving Proportion Problems

Question 1:

y is directly proportional to the cube root of x. When x = 8, y = 12, find y when x = 729.

54

Question 2:

y is directly proportional to the cube root of x. When x = 27, y = 30, find y when x = 1.

10

Question 3:

y is inversely proportional to the cube of x. When x = 5, y = 54, find y when x = 3.

250

Question 4:

y is inversely proportional to the square root of x. When x = 81, y = 36, find y when x = 144.

27