# If x: 8: 5:4, then find the value of x?

$Wehave,\phantom{\rule{0ex}{0ex}}x:8::5:4\phantom{\rule{0ex}{0ex}}\Rightarrow \frac{x}{8}=\frac{5}{4}\phantom{\rule{0ex}{0ex}}oncrossmultiplication\phantom{\rule{0ex}{0ex}}\Rightarrow x\times 4=5\times 8\phantom{\rule{0ex}{0ex}}\Rightarrow x=\frac{5\times 8}{4}\phantom{\rule{0ex}{0ex}}\Rightarrow x=5\times 2\phantom{\rule{0ex}{0ex}}\Rightarrow x=10$

thus the value of x is 10

Regards

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