Question

Which pair of ratios forms a proportion?

10 over 22. and 5 over 44.
16 over 9. and 8 over 18.
7 over 8. and 14 over 16.
20 over 24. and 40 over 12.

Answer 1

ratios are nothing but equivalent fractions

so is : 10/22 and 5/44 equivalent ?
10/22 = 5/11 and 5/44 = 1/11...so these are not equivalent, and thus do not form a proportion.

16/9 and 8/18.....8/18 = 4/9....these are not equivalent

7/8 and 14/16.....14/16 reduces to 7/8....these are equivalent fractions, thus, they make a proportion
you can even check, like this
7/8 = 14/16
cross multiply
(8)(14) = (7)(16)
112 = 112 (correct) --- this one is your answer

understand ?