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If a, b, c, d are in proportion, then...

If a, b, c, d are in proportion, then

A

ac = bd

B

ad = bc

C

ab = cd

D

none of these

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The correct Answer is:
B
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RS AGGARWAL-RATIO, PROPORTION AND UNITARY METHOD-EXERCISE 10D
  1. If 25:35 :: 45 : x, then the value of x is

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  2. If 4:5::X:35, then the value of x is

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  3. If a, b, c, d are in proportion, then

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

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  5. Choose the correct statement:

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  6. If ₹ 760 is divided between A and B in the ratio 8:11, then B's share ...

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  7. Two numbers are in the ratio 5 : 7 and the sum of these numbers is 252...

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  8. The sides of a triangle are in the ratio 1 : 3:5 and its perimeter is ...

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  9. The ratio of boys and girls in a school is 12: 5. If the number of gir...

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  10. If the cost of 12 pens is ₹ 138, then the cost of 14 such pens is

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  11. If 24 workers can build a wall in 15 days, how many days will 8 worker...

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  12. If 40 men can finish a piece of work in 26 days, how many men will be ...

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  13. In covering 111 km, a car consumes 6 L of petrol. How many kilometres ...

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  14. In a fort, 550 men had provisions for 28 days. How many days will it l...

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  15. The angles of a triangle are in the ratio 3: 1:2. The measure of the l...

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  16. Length and breadth of a rectangular field are in the ratio 5 : 4. If t...

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  17. If a bus covers 195 km in 3 hours and a train covers 300 km in 4 hours...

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  18. If the cost of 5 bars of soap is ₹ 82.50, then the cost of one dozen s...

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  19. If the cost of 30 packets of 8 pencils each is ₹ 600, what is the cos...

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  20. A rail journey of 75 km costs ₹ 215. How much will a journey of 120 km...

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