Solving Proportion Problems

Question 1:

x and y are in direct proportion. When x = 10, y = 90, find y when
x = 1.

9

Question 2:

x and y are in direct proportion. When x = 1, y = 15, find y when
x = 6.

90

Question 3:

x and y are in direct proportion. When x = 9, y = 63, find y when
x = 11.

77

Question 4:

x and y are in inverse proportion. When x = 1, y = 60, find y when
x = 12.

5