Advertisements
Advertisements
प्रश्न
Find the third proportional to `5(1)/(4) and 7.`
Advertisements
उत्तर
Let x be the third proportional to `5(1)/(4) and 7`
then `5(1)/(4) : 7 : : 7 : x`
⇒ `(21)/(7) : 7 : : 7 : x`
∴ `(21)/(4) xx x` = 7 x 7
x = `(7 xx 7 xx 4)/(21)`
= `(28)/(3)`
= `9(1)/(3)`
∴ Third proportional = `9(1)/(3)`.
APPEARS IN
संबंधित प्रश्न
If x2, 4 and 9 are in continued proportion, find x.
If (a2 + b2)(x2 + y2) = (ax + by)2; prove that: `a/x = b/y`.
Find the mean proportional of the following:
17.5, 0.007
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 a, b, c are in continued proportion, prove that a : c = (a2 + b2) : (b2 + c2).
Write (T) for true and (F) for false in case of the following:
36 : 45 : : 80 : 100
The cost of 4 dozen bananas is Rs 104. How many bananas can be purchased for Rs 6.50?
If a, b, c, d are in continued proportion, prove that: a : d = triplicate ratio of (a – b) : (b – c)
Are the following statements true?
45 km : 60 km = 12 hours : 15 hours
What is the term "d" called in the expression a : b :: c : d?
