No, it is not equivalent.
Think of it this way. If you had £12 and I had £5 then you would have money in the ratio of 12 to 5 compared to me. If you then only had £5 and I had £17 (which represents the new ratio of 5 to 17) you would not agree that this was equivalent as a proportion (you would rightly feel that you had lost out)!
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6 to 5
It is: 12/20 = 3/5
To find the equivalent ratio of 12 to 5, you can multiply both numbers by the same non-zero integer. For example, multiplying both by 2 gives you an equivalent ratio of 24 to 10. Similarly, multiplying by 3 would yield 36 to 15. Thus, equivalent ratios can be represented as (12n) to (5n) for any integer n.
Don't you mean 17 on a 24 hour clock? That refers to (17-12)= 5:00PM
There cannot be a common ratio for only one number.