Advertisements
Advertisements
Question
Find the fourth proportional to 1.5, 2.5, 4.5
Advertisements
Solution
Let fourth proportional to 1.5, 2.5, 4.5 be x
then 1.5 : 2.5 : : 4.5 : x
∴ 1.5 × x = 2.5 x 4.5
x = `(2.5 xx 4.5)/(1.5)`
= 7.5.
APPEARS IN
RELATED QUESTIONS
If `a/b = c/d`, show that: `(a^3c + ac^3)/(b^3d + bd^3) = (a + c)^4/(b + d)^4`.
If a, b, c and d are in proportion prove that `(13a + 17b)/(13c + 17d) = sqrt((2ma^2 - 3nb^2)/(2mc^2 - 3nd^2)`
Find mean proportional of `( x + y)/( x - y), (x^2 - y^2)/(x^2y^2)`
If a, b, c and dare in continued proportion, then prove that
(a+ d)(b+ c)-(a+ c)(b+ d)= (b-c)2
If a, b, c are in continued proportion, prove that: `(1)/a^3 + (1)/b^3 + (1)/c^3 = a/(b^2c^2) + b/(c^2a^2) + c/(a^2b^2)`
Choose the correct answer from the given options :
The third proportional to `6(1)/(4)` and 5 is
Are the ratios 25g: 30g and 40 kg: 48 kg in proportion?
10 books is to 15 books as 3 books is to 15 books
What number must be added to each of the numbers 4, 6, 8, 11 in order to get the four numbers in proportion?
A picture frame’s length and width are in the ratio 4 : 3. If the length is 28 cm, what is the width?
