How to convert 390 US gallons to dry gallons?
We know (by definition) that:
We can set up a proportion to solve for the number of dry gallons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 dry gallon is equal to 0.00298371073371073 times 390 US gallons.
It can also be expressed as: 390 US gallons is equal to dry gallons.
An approximate numerical result would be: three hundred and ninety US gallons is about three hundred and thirty-five point one four dry gallons, or alternatively, a dry gallon is about zero times three hundred and ninety US gallons.
 The precision is 15 significant digits (fourteen digits to the right of the decimal point).Results may contain small errors due to the use of floating point arithmetic.