Solving Proportion Problems

Question 1:

x and y are in direct proportion. When x = 1, y = 6, find y when
x = 9.

54

Question 2:

x and y are in inverse proportion. When x = 12, y = 90, find y when
x = 10.

108

Question 3:

x and y are in direct proportion. When x = 12, y = 72, find y when
x = 9.

54

Question 4:

x and y are in direct proportion. When x = 6, y = 36, find y when
x = 12.

72