Answers

2014-05-01T22:46:13+05:30
Let the third proportional to 15 and 30 be x. 
then, 30* 30 = 15 * x [ b square = ac]
=> x = (30 * 30)/ 15 
=> 900/15
hence x = 60.
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hope this helps u idhimoh21
r u sure its the rigt ans.?
thank u 4 ur ans. bt which formula u use pls tell me?
2014-05-01T22:59:59+05:30
Let it be x,then
15/30=30/x         (if a,b,c are in G.P.,ratios of terms are same,i.e.,b/a=c/b,b^2=ac)
x=30*30/15
x=60
therefore,third proportional is 60
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