Four Fours/Lemmata/One Four/4 Ninths

Puzzle
Using exactly $1$ instance of the number $4$, it is possible to write an expression for $\dfrac 4 9$, using whatever arithmetical operations are necessary:
 * $\dfrac 4 9 = .\dot 4$

where $.\dot 4$ means $0.4444 \ldots$