1.

Find the fourth proportional to 4, 9, 12;

Answer»

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

Then, 4 : 9 : : 12 : x 

4 x x=9 x12 

X=(9 x 12)/14=27; 

Fourth proportional to 4, 9, 12 is 27.



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