Advertisements
Advertisements
Question
The mean proportional between 4 and 9 is ______.
Options
4
6
9
36
Advertisements
Solution
The mean proportional between 4 and 9 is 6.
Explanation:
Mean proportional of 4 and 9
= `sqrt(4 xx 9)`
= `sqrt(36)`
= 6
APPEARS IN
RELATED QUESTIONS
Find the fourth proportional to 1.5, 4.5 and 3.5
If a, b and c are in continued proportion, prove that: a: c = (a2 + b2) : (b2 + c2)
Find mean proportional of `( x + y)/( x - y), (x^2 - y^2)/(x^2y^2)`
Find the smallest number that must be subtracted from each of the numbers 20, 29, 84 and 129 so that they are in proportion.
If u, v, w, and x are in continued proportion, then prove that (2u+3x) : (3u+4x) : : (2u3+3v3) : (3u3+4v3)
Write (T) for true and (F) for false in case of the following:
81 kg : 45 kg : : 18 men : 10 men
In an army camp, there were provisions for 550 men for 28 days. But, 700 men attended the camp. How long did the provisions last?
If a, b, c, d are in continued proportion, prove that: `(a^3 + b^3 + c^3)/(b^3 + c^3 + d^3) = a/d`
A student said that the ratios `3/4` and `9/16` were proportional. What error did the student make?
If `(a + b)^3/(a - b)^3 = 64/27`
- Find `(a + b)/(a - b)`
- Hence using properties of proportion, find a : b.
