Question

4. Check by the method of cross-products whether 13, 39, 3 and 9 are in proportion or
not.​

Answer 1

yess they are in proportion..

13/39 = 3/9

By cross multiplication we get..

13 × 9 = 3 × 39

117 = 117

Answer 2

To prove:

13:39 : : 3:9

or

13/39 = 3/9

9*13 = 3*39

9*13=117

3*39=117

Hence proved 13:39 : : 3:9

#BAL #answerwithquality