please help me answer this question about rectangles

Answer:
5.14
Step-by-step explanation:
The similarity ratio is 4/7 we can write an equation to find x
4/7 = 9/x cross multiply
7x = 36 divide both sides by 7
x = 5.14 approximately
Answer:
The answer is B
Step-by-step explanation:
5.14 hope this helps. :)