The figures are similar. Find x. The ratio of the perimeters is 7 : 10 how do I find x

The value of x from the given figures is 8.4
Since the given figures are similar, hence;
Since their perimeters are in the ratio of 7: 10 and the sides given are in the ratio of x: 12, hence:
[tex]\frac{7}{10}= \frac{x}{12} \\Cross \ multiply\\10x = 7 \times 12\\10x = 84\\x = \frac{84}{10}\\x=8.4[/tex]
Hence the value of x from the given figures is 8.4
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