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To determine the width of the similar rectangle, we can set up a proportion using the ratio of the corresponding sides of the two rectangles.
Let x be the width of the similar rectangle. We can set up the proportion:
$\frac{2}{4} = \frac{1}{x}$
Cross-multiplying, we have:
$2x = 4(1)$
$2x = 4$
Dividing both sides by 2, we get:
$x = 2$
Therefore, the width of the similar rectangle is 2.