In the given division, you have that number 9 left side is the denominator of the corresponding fraction and numerator is number 4.000 right side.
Then, the associated fraction to the given division is 4/9 (because zeros right side decimal point of 4.000 are not significant digits).
The decimal number of the fraction 4/9, as it can be noticed in the division is 0.444...
Hence, 4/9 and 0.4 match with the given division