Hello, how can I find the proportional relation for the chart "D"?

Answer:
All u have to do is divide those numbers and see what they have in common.
Step-by-step explanation:
To find a mean proportional. There are various uses of the square root, one of which is to find a mean proportional between any two numbers, which is performed thus: Multiply the two given numbers together, then extract the square root out of their product, and it will be the mean proportional sought.