3. If a, b, c and d are in proportion, then find the condition for proportionality.
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If a : b : : c : d, then d is called the fourth proportional of a, b, c. Also, If a : b :: b : c, then we say that a, b, c are in continued proportion, then c is the third proportional of a and b. Also, b is called the mean proportional between a and C.
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