Advertisements
Advertisements
Question
Find the fourth proportional to 9.6 kg, 7.2 kg, 28.8 kg
Advertisements
Solution
Let fourth proportional to 9.6 kg, 7.2 kg, 28.8 kg be x
then 9.6 : 7.2 : : 28.8 : x
⇒ 9.6 × x = 7.2 x 28.8
x = `(7.2 xx 28.8)/(9.6)`
= 21.6.
APPEARS IN
RELATED QUESTIONS
If a, b and c are in continued proportion, prove that `(a^2 + b^2 + c^2)/(a + b + c)^2 = (a - b + c)/(a + b + c)`
Find the third proportion to the following :
(x - y) and m (x - y)
What quantity must be added to each term of the ratio a + b: a - b to make it equal to (a + b)2 : (a - b)2 ?
If 2x – 1, 5x – 6, 6x + 2 and 15x – 9 are in proportion, find the value of x.
If `a/c = c/d = c/f` prove that : (b2 + d2 + f2) (a2 + c2 + e2) = (ab + cd + ef)2
If a, b, c are in continued proportion, prove that: a : c = (a2 + b2) : (b2 + c2)
If a, b, c are in continued proportion, prove that: abc(a + b + c)3 = (ab + bc + ca)3
If two ratios are equal, then they are in ______.
Are the following statements true?
40 persons : 200 persons = ₹ 15 : ₹ 75
A picture frame’s length and width are in the ratio 4 : 3. If the length is 28 cm, what is the width?
