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Ratio class - 9(Proportion - 3)
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Continued proportions

## Bharat Gupta is teaching live on Unacademy Plus

Bharat Gupta
Engineer by degree Mathematician by Heart. Having 22 years of teaching experience. More than 20000 students selected.

U
sir I didnt get the number line of f(x)=-x-sinx
CB
sir,, by taking 1,2,2,4 in last 2 questions answers is not match,,, why?????
AS
Aakansha Sinha
10 months ago
1,2,2,4, are not in continued proportion as for continued proportion the condition: b^2=ac and c^2=bd should be satisfied. 1,2,2,4 does not satisfy this condition whereas 1,2,4,8 does satisfy this condition
in last ques why can't we take 1,2,2,4?
AS
Aakansha Sinha
10 months ago
1,2,2,4, are not in continued proportion as for continued proportion the condition: b^2=ac and c^2=bd should be satisfied. 1,2,2,4 does not satisfy this condition whereas 1,2,4,8 does satisfy this condition
RR
sir in the last question from 11.09 till the finisher i couldn't get the solving u told 4*4*4/4*4*8+8*8*8 , 64/16*8+512, 1/16*8+8, /136 how could u get 1/10 or otherwise 64/16*8+8*8*8, 1/2+8*8*8, 1/514 will be the answer how did u get 1/10 can you please explain
Pravin kumar
3 months ago
Don't follow sir's way, beacuse there is plus in denominator. so he mistakely cut the powers, we have to plus first then we will get 64/640 that is 1/10.
Pravin kumar
3 months ago
Don't follow sir's way, beacuse there is plus in denominator. so he mistakely cut the powers, we have to plus first then we will get 64/640 that is 1/10.
we can take values as 1,1,1,1
RR
sir 8:06 by solving i get 1/16 bit confused help!
1. RATIO AND PROPORTION Class - 10 (Proportion part 3)

2. Continued Proportion 4, 9, 16 ae in co a, , car, in Co

3. a, b, eld, e cuu c.uhind mohat.. 2

4. If 3, 9 and x are in continued proportion, find x a. 15 b. 21 C. 27 d. 30

5. If 3, 9 and x are in continued proportion, find x a. 15 b. 21 C. 27 d. 30 3,9, 21 2

6. If 48, x and 75 are in continued proportion, find x a. 52 b. 60 C. 64 d. 72

7. If 48, x and 75 are in continued proportion, find x a. 52 b. 60 C. 64 d. 72

8. If a, b and c are in continued proportion, find value of a. b2 a2-b2+c2 a-2-b-2+C-2 b. b4 c. b d. 1

9. If a, b and c are in continued proportion, find value of a. b2 a2-b2+c2 a-2-b-2+C-2 b. b4 c. b d. 1 2 2. 2. 2. 2