639 US customary teaspoons in dry gallons

Conversion formula
How to convert 639 US customary teaspoons to dry gallons?

We know (by definition) that: $1\mathrm{usteaspoon}\approx 0.00111896745751993\mathrm{drygallon}$

We can set up a proportion to solve for the number of dry gallons.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 639 ⁢ usteaspoon ≈ 0.7150202053552352 ⁢ drygallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 dry gallon is equal to 1.39856187630836 times 639 US customary teaspoons.

It can also be expressed as: 639 US customary teaspoons is equal to $\frac{1}{\mathrm{1.39856187630836}}$ dry gallons.

Approximation

An approximate numerical result would be: six hundred and thirty-nine US customary teaspoons is about zero point seven two dry gallons, or alternatively, a dry gallon is about one point three nine times six hundred and thirty-nine US customary teaspoons.