Question 893973
Knowing the ratio between the dimensions but not knowing either dimension exactly means, the dimensions are unknown factors of some value, x.
4x is one dimension and 7x the other dimension.


{{{2(4x+7x)=154}}}
{{{2(11x)=154}}}
{{{11x=77}}}
{{{x=77/11}}}
{{{x=7}}}


THAT is the factor to use.
{{{4*7}}} is one dimension and {{{7*7}}} is the other dimension.