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Fourth, third and mean proportional
i). Fourth Proportional:
If a : b = c : d, then d is called the fourth proportional to a, b, c.
ii). Third Proportional:
a : b = c : d, then c is called the third proportion to a and b.
iii). Mean Proportional:
Mean proportional between a and b is \begin{aligned} \sqrt{ab} \end{aligned}
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