SOLUTION: Which of the following is NOT a proportion? : 3/2=15/10 17/4=85/20 8/3=48/18 11/13=66/91

Algebra ->  Proportions -> SOLUTION: Which of the following is NOT a proportion? : 3/2=15/10 17/4=85/20 8/3=48/18 11/13=66/91      Log On


   

Question 1010657: Which of the following is NOT a proportion? :
3/2=15/10
17/4=85/20
8/3=48/18
11/13=66/91
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
3%2F2%22%22=%22%2215%2F10

Multiply the upper left number by the lower right number, get 3×10=30
Multiply the upper right number by the lower left number, get 15×2=30
They are the same, so this is a proportion.

17%2F4%22%22=%22%2285%2F20

Multiply the upper left number by the lower right number, get 17×20=340
Multiply the upper right number by the lower left number, get 85×4=340
They are the same, so this is a proportion.


8%2F3%22%22=%22%2248%2F18

Multiply the upper left number by the lower right number, get 8×18=144
Multiply the upper right number by the lower left number, get 48×3=144
They are the same, so this is a proportion.

11%2F13%22%22=%22%2266%2F91

Multiply the upper left number by the lower right number, get 11×91=1001
Multiply the upper right number by the lower left number, get 66×13=858
They are NOT the same, so this is NOT a proportion.

Edwin