The figures are similar. The ratio of the perimeters is $7: 10$. Find $x$.
\[
x=\square
\]

Answer

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Answer

So, the final answer is $ x = \boxed{7} $.

Steps

Step 1 ：Define the ratio of the perimeters as $ \frac{7}{10} $.

Step 2 ：Define the side of the larger figure as 10.

Step 3 ：Calculate $ x $ by multiplying the ratio of the perimeters with the side of the larger figure, which gives $ x = 0.7 \times 10 $.

Step 4 ：So, the final answer is $ x = \boxed{7} $.