Question 171330
I think I understand your problem as the length is actually 10, the width is unknown and the length and width are in proportion 19/10:1.


So,

{{{10/x=(19/10)/1}}}


Cross multiply:


{{{(19/10)x=10}}}


Divide by {{{19/10}}}


{{{x=10(10/19)=100/19}}}


Which the calculator says is roughly 5.26.  This makes good sense because the ratio is just a little less than 2:1, so you would expect the width to be a little larger than half of the length.  Hope that helps.