Question

fourth proportional of 4 and 12 is what
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Answer 1

Answer:

Let the fourth proportional to 4, 9, 12 be x

Then, 4:9::12:x

⇒4×x=9×12

⇒x=

4

9×12

=27

∴ Fourth proportional to 4, 9, 12 is 27.