3 : 5 : : □ : 20

3 : 5 : : `square` : 20

Fill in the Blanks

3 : 5 : : 12 : 20

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

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

Find the fourth proportional to 3a, 6a² and 2ab²

Find the mean proportional between a – b and a³ – a²b

If x and y be unequal and x : y is the duplicate ratio of x + z and y + z, prove that z is mean proportional between x and y.

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

Verify the following:

108 : 72 : : 129 : 86

Show that the following numbers are in continued proportion:

48, 60, 75

If 48 boxes contain 6000 pens, how many such boxes will be needed for 1875 pens?

The length and breadth of a rectangular field are in the ratio 5 : 4. If the width of the field is 36 m, what is its length?

If a, b, c, d are in continued proportion, prove that: (a² – b²) (c² – d²) = (b² – c²)²

Write True (T) or False (F) against the following statement:

0.9 : 0.36 : : 10 : 4