Proportion

If x : 8 :: 3 : 4 , find x.

• 6

• 7

• 8

• 5

If x², 4 and 9 are in continued proportion, find x.

• 4/3

• 3/4

• 5/3

• 3/5

Find the least number which must be added to each of the numbers 16, 7, 79 and 43, so that the resulting numbers are in proportion.

• 4

• 5

• 6

• 3

Find third proportional of 9 and 15

• 25

• 15

• 30

• 20

Find mean proportional of 80 and 5

• 25

• 15

• 30

• 20

Find two numbers whose mean proportional is 28 and third proportional is 224.

• 14, 56

• 10, 50

• 28,7

• 35, 42

If b is the mean proportional of a and c then the value of

(a² - b² + c²) / (a^-2- b^-2+ c^-2) is

• b⁴

• b²

• b

• b³

 $\left(\frac{2x^3-3y^3+5z^3}{2a^3-3b^3+5c^3}\right)^{^{^{^{\frac{1}{3}}}}}$  

If x/a = y/b = z/c = k, then find in terms of k the value of the above.

• k

•  $k^2$  

•  $k^3$  

•  $k^{\frac{1}{3}}$  

If (x-2), (x+2), (2x+1) and (2x+19) are in proportion, find the value of x.

• 3

• 4

• 5

• 2

What must be subtracted from each of 23, 30,57 and 78 so that the remainders are in proportion.

• 4

• 5

• 6

• 3