Math
posted by Lelo .
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
2. 12/35 , 24/75
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
I really suck at math. PLEASE help me.

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. 
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. 
I finished. I got them all right.

Can you help me? I have the same problems and don't understand this :(

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