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If a ,\ b ,\ c ,\ d are in proportion, t...

If `a ,\ b ,\ c ,\ d` are in proportion, then
(a)`a b=c d`
(b) `a c=b d`
(c) `a d=b c`
(d) None of these

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RD SHARMA ENGLISH-RATIO, PROPORTION AND UNITARY METHOD-All Questions
  1. If 4,\ a ,\ a ,\ 36 are in proportion, then a= (a) 24 (b) 12 (c)...

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  2. If 5:4 :: 30 : x , then the value of x is (a) 24 (b) 12 (c) 3/2...

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  3. If a ,\ b ,\ c ,\ d are in proportion, then (a)a b=c d (b) a c=b d ...

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  4. If a ,\ b ,\ c are in proportion, then (a) a^2=b c (b) b^2=a c ...

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  5. If the cost of 5 bars of a soap is Rs. 30, then the cost of one doze...

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  6. 12 men can finish a piece of work in 25 days. The number of days in ...

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  7. If the cost of 25 packets of 12 pencils each is RS. 750, then the co...

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  8. If a, b, c are in continued proportion, then which of the following to...

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  9. If a=2b ,\ then a : b= (a) 2:1 (b) 1:2 (c) 3:4 (d) 4:3

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  10. If 4:3=x^2: 12 , then the value of x\ (x >0)dot (a) 16 (b) 4 (c)...

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  11. If x : y=2:3 and y : z=2:3, then x : z= (a) 2:3 (b) 3:4 (c) 5:...

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  12. If 80 : 60=x : 12 , then x= (a) 16 (b) 7 (c) 24 (d) 50

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  13. Two numbers are in the ratio 3:5 and their sum is 96. The larger num...

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  14. If x : y=1:1,\ t h e n\ (3x+4y)/(5x+6y)= (a) 7/(11) (b) (17)/(11) ...

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  15. If six men can do a piece of work in 6 days, then 3 men can do same ...

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  16. If 4:5::x : 45, then x= (a) 54 (b) 60 (c) 36 (d) 30

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  17. If 343 is the third proportional of a and b , where a : b=1:7, then th...

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  18. The first three terms of a proportion are 12, 21 and 8 respectively....

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  19. If a : b=2:5, . find the value of (3a+2b)/(4a+b)

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  20. The mean proportional of a and b is 10 and the value of a is four time...

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