Solving Proportion Problems

Question 1:

x and y are in inverse proportion. When x = 10, y = 48, find y when
x = 12.

40

Question 2:

x and y are in direct proportion. When x = 3, y = 12, find y when
x = 6.

24

Question 3:

x and y are in inverse proportion. When x = 4, y = 8, find y when
x = 1.

32

Question 4:

x and y are in inverse proportion. When x = 6, y = 39, find y when
x = 3.

78