(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Find the fourth proportional to 1.5, 2.5, 4.5

Find the fourth proportional to 9.6 kg, 7.2 kg, 28.8 kg

Find the third proportional to 5, 10

Find the third proportional to 0.24, 0.6

Find the third proportional to Rs. 3, Rs. 12

Find the third proportional to `5(1)/(4) and 7.`

Find the mean proportion of: 5 and 80

Find the mean proportion of: `(1)/(12) and (1)/(75)`

Find the mean proportion of: 8.1 and 2.5

Find the mean proportion of: (a – b) and (a³ – a²b), a> b

If a, 12, 16 and b are in continued proportion find a and b.

What number must be added to each of the numbers 5, 11, 19 and 37 so that they are in proportion?

What number should be subtracted from each of the numbers 23, 30, 57 and 78 so that the remainders are in proportion ?

If x + 5 is the mean proportion between x + 2 and x + 9, find the value of x.

If 2x – 1, 5x – 6, 6x + 2 and 15x – 9 are in proportion, find the value of x.

What number must be added to each of the numbers 16, 26 and 40 so that the resulting numbers may be in continued proportion?

Find two numbers such that the mean proportional between them is 28 and the third proportional to them is 224.

If b is the mean proportional between a and c, prove that a, c, a² + b², and b² + c² are proportional.

If b is the mean proportional between a and c, prove that (ab + bc) is the mean proportional between (a² + b²) and (b² + c²).

If y is mean proportional between x and z, prove that xyz (x + y + z)³ = (xy + yz + zx)³.