Convert 4 months to fraction form assuming 360-day year

I converted the four months into a fraction, and got 1/3. There's 12 months in a year, and divided by 4, I got 3.

There are 12 months in a year, so four months would be 4/12 of a year. That fraction can be reduced.

There are 365 days in a year, but this is sometimes rounded off to 360 days.

Four months amounts to approx. 120 days. Note that 120 days / 360 days can be reduced. You should get the same result either way.