How do you simplify a ratio to get to the form 1 : n ?

The first number must be 1, so we divide both numbers by the first number.

Q: Write 3 : 4 in the form 1 : n

A: divide both numbers by 3.

1 : 4/3

Q: Write 8 : 7 in the form 1 : n

A: divide both numbers by 8.

1 : 7/8

If you start with a ratio of a: b and need to get to 1:n, then you would divide a and b by a then you would have the ratio 1: b/a, so n would equal b/a.