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By: Sai Janani

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Three numbers 'a', 'b' and 'c' are said to be continued proportion if a, b and c are in proportion. Continued-proportion is also known as mean proportional . If 'b' is a mean proportional between a and c then b ² = ac.

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A metal bar ten feet long weighs 128 pounds. What is the weight of a similar bar that is two feet four inches long?

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1st step :
2 feet + 4 inches
2 feet + 1/3 feet
= 7/3 feet

2nd step :
length / weight :  10/128
= 29.87 pounds or 448/15

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a small video on proportions :-