Express the ratio 16: 9 as a ratio to 1

I think it's 1.77777777778(7 is repeating) to1.
16/9=1.778

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?