Rectangle EFGH is similar to rectangle JKLM. Which proportion can be used to find the value of x?

To find the proportion that can be used to find the value of x, we need to identify the corresponding sides of the similar rectangles EFGH and JKLM. Let's label the sides of rectangle EFGH with lowercase letters and the sides of rectangle JKLM with uppercase letters.

Let's say the lengths of the sides of rectangle EFGH are:
EF = a
FG = b
GH = c
HE = d

And the lengths of the sides of rectangle JKLM are:
JK = A
KL = B
LM = C
MJ = D

Since the rectangles are similar, the corresponding sides are proportional. The side lengths' ratios will be equal.

To find the proportion that can be used to find the value of x, we can compare the corresponding sides. In this case, we can compare the lengths of EF (a) and MJ (D) since they are corresponding sides.

The proportion is:

EF / MJ = a / D

So, the proportion we can use to find the value of x is a / D.