Solving Proportion Problems

Question 1:

y is directly proportional to the cube root of x. When x = 343, y = 42, find y when x = 729.

54

Question 2:

y is directly proportional to the square of x. When x = 8, y = 512, find y when x = 7.

392

Question 3:

y is inversely proportional to the square root of x. When x = 4, y = 21, find y when x = 49.

6

Question 4:

y is inversely proportional to the cube root of x. When x = 64, y = 8, find y when x = 8.

16