In order to find more equivalent ratios you must multiply by 2 or more. 2 is easiest so
(2)7 and (2)3= 14:6
Thats is one equivalent ratio now 2 more.
14(2) and 6(2)= 28:12
Last but not least
28(2) and 12(2)= 56:24
For the explanation: they are equal because we are multiplying the numbers by the same numbers which allow them to be increased at the same rate. It is like we are unsimplifying a fraction.