Solving Proportion Problems

Question 1:

y is directly proportional to the square root of x. When x = 4, y = 12, find y when x = 1.

6

Question 2:

y is directly proportional to the cube of x. When x = 4, y = 640, find y when x = 12.

17280

Question 3:

y is inversely proportional to the square root of x. When x = 9, y = 30, find y when x = 36.

15

Question 4:

y is inversely proportional to the cube root of x. When x = 125, y = 9, find y when x = 125.

9