Aptitude - Ratio and Proportion - Discussion
Discussion Forum : Ratio and Proportion - General Questions (Q.No. 13)
13.
The fourth proportional to 5, 8, 15 is:
Answer: Option
Explanation:
Let the fourth proportional to 5, 8, 15 be x.
Then, 5 : 8 : 15 : x
5x = (8 x 15)
| x = | (8 x 15) | = 24. |
| 5 |
Discussion:
34 comments Page 4 of 4.
Sai said:
1 decade ago
Formula must be used compulsory ? we can assume it as in series form as 5, 15, 25, 35.... In same manner 8, 18, 28......
Manik said:
1 decade ago
Is this formula applicable for such other problems? What abt the formula of fifth, sixth or higher proportional?
Malli said:
1 decade ago
There is 5:8:15:x then as for formula
1st x 4th=2nd x 3rd
i.e 5*x=8*15(it is a formula)
there four x=24
1st x 4th=2nd x 3rd
i.e 5*x=8*15(it is a formula)
there four x=24
Jaskaran said:
2 decades ago
How come 5x ? Please explain in detail.
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