Find the third proportion? 6,12

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Answer 1 · 2018-02-19T08:14:27

#24#

A direct proportion has #4# proportionals.

#a/b = c/d#

However, sometimes the second and third have the same value.
#(b=c)#

In this case they are called the mean proportional and the last one is then known as the third proportional.

This means we have:

#6/12 = 12/x" "# which can be written as two equal ratios:

#6:12 = 12:x:#

Cross-multiply to get

#6x = 144#

#x=24#