Question

MEDAL :) Please help me
Which ratios do not form a proportion?
A. 24/96 , 27/108
B. 17/102 , 12/70
C. 21/51 , 35/85
B. 45/75 , 63/105

Answer 1

@I_Need_Help_With_Home

Answer 2

please help me @aum

Answer 3

If a/b = c/d then, a*d = b*c (cross-multiplying).

So IF 24/96 = 27/108 then check if 24*108 is equal to 27*96

Answer 4

I got 2916

Answer 5

I did 108 x 24

Answer 6

If 24 x 108 = 27 x 96 then 24/96 and 27/108 form a proportion.

Answer 7

But I need to know which ratios do not form a proportion

Answer 8

Ok then so I multiply the same numbers with each other choices

Answer 9

Correct. Try the same method with each answer choice and see which one is not true.

Answer 10

So would it be C.

Answer 11

@aum

Answer 12

B. 17/102 , 12/70
17 x 70 = 1190
12 x 102 = 1224
1190 is not equal to 1224.
Therefore 17/102 and 12/70 do NOT form a proportion.

Try the other two choices too just to make sure.

Answer 13

All you have to do is cross-multiply and check if they are the same.

Answer 14

\[
\frac{21}{51}, ~~~\frac{35}{85} \\
\text{Cross-multiply:} \\
21 \times 85 = 1785 \\
35 \times 51 =1785 \\
\text{Both are the same. Therefore, they form a proportion.}
\]