SOLUTION: If a:b=4:5 and b:c=7:8, find a:b:c

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Question 1125866: If a:b=4:5 and b:c=7:8, find a:b:c
Found 2 solutions by Alan3354, josmiceli:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
If a:b=4:5 and b:c=7:8, find a:b:c
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a:b=4:5 --> a:b = 28:35
b:c=7:8 --> b:c = 35:40
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a:b:c = 28:35:40

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+a%2Fb+=+4%2F5+
+a+=+%284%2F5%29%2Ab+
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+b%2Fc+=+7%2F8+
+c+=+%288%2F7%29%2Ab+
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(4/5)*b : b : (8/7)*b
multiply ratio by +35+
28b : 35b : 40b
divide ratio by +b+
28:35:40