721 feet in kilometers

Conversion formula
How to convert 721 feet to kilometers?

We know (by definition) that: $1\mathrm{ft}=0.0003048\mathrm{km}$

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

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

Conclusion: 721 ⁢ ft = 0.21976079999999998 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 4.55040207352722 times 721 feet.

It can also be expressed as: 721 feet is equal to $\frac{1}{\mathrm{4.55040207352722}}$ kilometers.

Approximation

An approximate numerical result would be: seven hundred and twenty-one feet is about zero point two two kilometers, or alternatively, a kilometer is about four point five four times seven hundred and twenty-one feet.