2. Find the third proportional to 4 and 5
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Let x be the third proportion
4:5 :: 5:x
===> 4/5 = 5/x
===> 4x = 25
===> x = 25/4 = 6.25
4:5 :: 5:x
===> 4/5 = 5/x
===> 4x = 25
===> x = 25/4 = 6.25
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