ratios a : b and c:d are in proportion, if:
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It is easy to calculate if ratios are proportional. To check if the ratio a: b and c: d is proportional. Two ratios a: b and b: c is said to be in continued proportion if a: b = b: c. In this case, the term c is called the third proportion of a and b whereas b is called the mean proportion of between the terms a and c.
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