How to convert 138 US customary cups 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 0.134915615785181 times 138 US customary cups.
It can also be expressed as: 138 US customary cups is equal to dry gallons.
An approximate numerical result would be: one hundred and thirty-eight US customary cups is about seven point four one dry gallons, or alternatively, a dry gallon is about zero point one three times one hundred and thirty-eight US customary cups.
 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.