Question

if 25:35::45:x then the value of x is

Answer 1

63 =x value
25:35::45:63

Answer 2

Hey there !!
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Here we have

25 : 35 :: 45 : x

we can write it as
$\frac{25}{35} = \frac{45}{x} \\ \\ = 25 \times x = 45 \times 35 \\ \\ = 5x = 9 \times 35 \\ \\ = > x = 9 \times 7 \\ \\ = > x = 63$
Hope this would help you !!