Answer:
Hence, the proportion which can be used to represent the pictures size is:

Explanation:
It is given that:
Michelle is having a poster printed from a picture that is 4 inches wide by 6 inches tall.
i.e. the dimensions of picture are: 4 inches×6 inches.
The dimensions of The enlarged poster is 20 inches wide and 30 inches tall.
i.e. the dimensions of enlarged picture are : 20 inches×30 inches.
Hence, the proportion which can be used to represent the pictures size is:
