To convert pints to milliliters, we first need to determine how many milliliters are in one pint.
1 pint = 2 cups
1 quart = 2 pints, which means 1 pint = 0.5 quarts.
Using the conversion for quarts to milliliters:
1 quart = 946.35 milliliters,
then:
1 pint = 0.5 quarts = 0.5 * 946.35 mL = 473.175 mL.
Now, to find out how many milliliters are in 3 pints: 3 pints = 3 * 473.175 mL = 1419.525 mL.
Rounding to the nearest tenth: 1419.5 mL.
So the answer is: 1419.5 mL.