Math

Which ratios does NOT form a proportion?

1. 24/96 , 27/108
2. 17/102 , 12/70
3. 21/51 , 35/85
4. 45/75 , 63/105

Which ratios form a proportion? Use cross products to test each pair.

1. 9/17 , 27/50
3. 15/55 , 33/ 121
4. 12/35 , 20/70

Which ratio forms a proportion with 20/30? Use equivalent ratios to test each ratio.

1. 16/24
2. 10/20
3. 17/51
4. 15/60

Which ratio forms a proportion? Use equivalent ratios to test each pair.

1. 4/9 , 2/3
2. 6/15 , 9/12
3. 12/16 , 15/20
4. 18/20 , 24/30

Which ratios form a proportion? Use cross products to test each pair.

1. 15/40 , 35/90
2. 18/22 , 45/55
3. 12/55 , 33/121
4. 17/31 , 32/45

1. One way to solve these problems is to find the decimal equivalent of each fraction.

24/96 = 0.25
27/108 = 0.25
These fractions form a proportion.

You can also use cross products

15/40 = 35/90
1350 = 1400 -- Nope! This is not a proportion.

posted by Ms. Sue
2. gee - why not follow the hints? Use cross products:

if

a/b = c/d, then ad = bc

So, for the first, try each pair:

1. 24/96 , 27/108 ? 24*108 = 96*27 YES
2. 17/102 , 12/70 ? 17*70 = 102*12 NO
3. 21/51 , 35/85 ? 21*85 = 51*35 YES
4. 45/75 , 63/105 ? 45*105 = 75*63 YES

Try the others in the same way. If you get stuck, come back and show how far you got.

posted by Steve
3. I finished. I got them all right.

posted by Lelo
4. Can you help me? I have the same problems and don't understand this :(

posted by helpasap
5. 3/4

posted by brian

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