5 : □ : : 10 : 8 : : 15 : □

5 : `square` : : 10 : 8 : : 15 : `square`

Fill in the Blanks

5 : 4 : : 10 : 8 : : 15 : 12

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Chapter 3: Ratio and Proportion - Exercise 3.3 [Page 58]

Chapter 3 Ratio and Proportion
Exercise 3.3 | Q 1. (iii) | Page 58

Find the fourth proportional to 1.5, 4.5 and 3.5

Find the fourth proportional to 2xy, x² and y².

Find the mean proportional to (x – y) and (x³ – x²y).

If x, y, z are in continued proportion prove that `(x + y)^2/(y + z)^2 = x/z`

Find the third proportional to 0.24, 0.6

Find the value of x in each of the following proportion:

27 : x : : 63 : 84

Write (T) for true and (F) for false in case of the following:

36 : 45 : : 80 : 100

If a, b, c and d are in proportion, prove that: (a⁴ + c⁴) : (b⁴ + d⁴) = a² c² : b² d².

Determine if the following are in proportion.

32, 48, 70, 210

Determine if the following are in proportion.

4, 6, 8, 12