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 2 of 4.
Divya said:
1 decade ago
Let the 4th proportional to 5:8::15:x.
Product of extremes = product of means.
5x = 8*15.
x = 120/5.
= 24.
Product of extremes = product of means.
5x = 8*15.
x = 120/5.
= 24.
Sandeep said:
6 years ago
5:8:15:x.
5/8=15/x.
When dividing 15 by 5, its come=3(upper parts are divided ).
Now multiply crossing,
x=24.
5/8=15/x.
When dividing 15 by 5, its come=3(upper parts are divided ).
Now multiply crossing,
x=24.
(5)
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
Arijit said:
5 years ago
If a:b :: c:d then;
d = b*c/a (Formula),
Here, d is called the fourth proportion of a, b and c.
d = b*c/a (Formula),
Here, d is called the fourth proportion of a, b and c.
(11)
Sumit Singh said:
11 months ago
The formula for finding the fourth proportional = b*c/a.
A = 5, B = 8, C = 15,
8*15/5 = 24.
A = 5, B = 8, C = 15,
8*15/5 = 24.
(4)
Sk.Rahul Basha said:
7 years ago
4th proportion formula.
d = bc/a.
Here. a=5,b=8,c=15,
Now submit in formula.
d=8*15/5=24.
d = bc/a.
Here. a=5,b=8,c=15,
Now submit in formula.
d=8*15/5=24.
(1)
Rahul v said:
3 years ago
The number of proportional are only in even numbers that's why they are proportional.
(1)
Jay said:
8 years ago
How to find fifth proportional?
Eg: Find the fifth proportional to 15, 18, 33, 51?
Eg: Find the fifth proportional to 15, 18, 33, 51?
(3)
Akash said:
2 months ago
Formula:
x = b * c/a.
Then substitue the given values;
8 * 15/5 = 120/5.
x = 24.
x = b * c/a.
Then substitue the given values;
8 * 15/5 = 120/5.
x = 24.
(2)
Kirshna said:
9 years ago
If 60 is the fourth proportional to 8, 15 and x ; find x.
Please solve this.
Please solve this.
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