Advertisements
Advertisements
Question
Find the third proportion to the following :
3 and 15
Advertisements
Solution
Let x be the third proportion
3 : 15 :: 15 : x
⇒ 3 × x- 15 x 15
⇒ 3 x = 225
⇒ x = 75
The third proportion is 75.
APPEARS IN
RELATED QUESTIONS
If a, b and c are in continued proportion, prove that `(a^2 + ab + b^2)/(b^2 + bc + c^2) = a/c`
If `(28 - x)` is the mean proportional of `(23 - x)`and `(19 - x)` then find the value of x.
Find the value of x in the following proportions : 10 : 35 = x : 42
Verify the following:
60 : 105 : : 84 : 147
If a, b, c and d are in proportion, prove that: (5a + 7b) (2c – 3d) = (5c + 7d) (2a – 3b).
If x, y, z are in continued proportion, prove that: `(x + y)^2/(y + z)^2 = x/z`.
10 books is to 15 books as 3 books is to 15 books
If 7 : 5 is in proportion to x : 25, then ‘x’ is
A recipe calls for 1 cup of milk for every `2 1/2` cups of flour to make a cake that would feed 6 persons. How many cups of both flour and milk will be needed to make a similar cake for 8 people?
Bachhu Manjhi earns Rs. 24000 in 8 months. At this rate, how much does he earn in one year?
