In the lead up to the school athletics carnival, Ronald was training with the javelin for three fourths of an hour each day after school due to some rain this week Ronald got 80% of his plan practice. How much hours of practice did Ronald get this week?

Ronald's planned practice time is three fourths of an hour each day after school.

He practiced for 80% of his planned practice time, which is 80/100 * 3/4 = 240/100 hours.
This is equal to 2.4/1 hours. Therefore Ronald practiced for 2.4 hours this week. Answer: \boxed{2.4}.

To find out how many hours of practice Ronald got this week, we need to calculate 80% of the total planned practice time.

1. Convert three-fourths of an hour to minutes:
3/4 hour = (3/4) * 60 minutes = 45 minutes

2. Calculate 80% of 45 minutes:
80/100 * 45 minutes = 0.8 * 45 minutes = 36 minutes

3. Convert the minutes back to hours:
36 minutes = 36/60 hours = 0.6 hours

Therefore, Ronald got 0.6 hours (or 36 minutes) of practice this week.