The ratio would be 1:7
4:28 = 1:7
22 to 28
1 over 4.
1 over 4
8/6
Yes.
4/3
1 over 7.
No
No. 4/7 and 16/28 and 28/49 are equivalent ratios. The 4 and the 7 must be multiplied by the same number in order to maintain the ratio.
1/4 is equivalent to 7/28; 4/7 is equivalent to 16/28; so the sum is 23/28, or 0.82 if you prefer it in decimal.