First, let's assume an average height for a giraffe is 18 feet, and the zookeeper's height is 6 feet.
To find the fraction of the giraffe's height as compared to the zookeeper's height, we will divide the zookeeper's height by the giraffe's height:
Fraction = (Zookeeper's height) / (Giraffe's height)
Fraction = 6 feet / 18 feet
Fraction = 1/3
So, the fraction of the giraffe's height compared to the zookeeper's height is 1/3.