To find the length of RS, we need to use the property of similar figures.
Since parallelogram KLMN is similar to parallelogram PQRS, the corresponding sides are proportional.
This means that the ratio of the lengths between the two parallelograms is equal.
Therefore, we can set up the proportion as follows:
LM/MN = QR/RS
8/28 = 4/RS
Cross multiply to solve for RS:
8 * RS = 4 * 28
8RS = 112
RS = 112 / 8
RS = 14
Therefore, the length of RS is 14 cm.