Solving Proportion Problems

Question 1:

x and y are in direct proportion. When x = 12, y = 156, find y when
x = 11.

143

Question 2:

x and y are in direct proportion. When x = 6, y = 60, find y when
x = 7.

70

Question 3:

x and y are in inverse proportion. When x = 3, y = 40, find y when
x = 10.

12

Question 4:

x and y are in direct proportion. When x = 7, y = 63, find y when
x = 9.

81