399 US quarts in dry quarts
Result
The conversion result is: 399 US quarts is equivalent to 342.887435942746 dry quarts.[1]
Conversion formula
How to convert 399 US quarts to dry quarts?
We know (by definition) that: 1 usquart ≈ 0.859367007375303 dryquart.
We can set up a proportion to solve for the number of dry quarts.
1 usquart / 399 usquart ≈ 0.859367007375303 dryquart / x dryquart
Now, we cross multiply to solve for our unknown x:
x dryquart ≈ (399 usquart / 1 usquart) * 0.859367007375303 dryquart → x dryquart ≈ 342.8874359427459 dryquart
Conclusion:
399 usquart ≈ 342.8874359427459 dryquart

Conversion in the opposite direction
The inverse of the conversion factor is that 1 dry quart is equal to 0.00291640898783756 times 399 US quarts.
It can also be expressed as: 399 US quarts is equal to 1 / 0.00291640898783756 dry quarts.
Approximation
An approximate numerical result would be: three hundred and ninety-nine US quarts is about three hundred and forty-two point eight eight dry quarts, or alternatively, a dry quart is about zero times three hundred and ninety-nine US quarts.
Footnotes
[1] 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.