So for this I would set up a ratio. 1/10=x/380 then you cross multiply so 1x380=10x. Then solve the equation so 380/10=x and you get 38in. Hope my explanation helped!
First multiply each term by 24(the common denominator found by 8×3) to remove the fractions and make things easier. This will give you, Then just continue to simplify and isolate the variable.