Question 790734
 you can set this up as a ratio 


    {{{1/ 4 = bone length/total height }}}

since the bone length is given we then have 

{{{1/4 = 19.75in/total height}}}

we can then cross multiply and you get {{{ 4 X 19.75 = 1 x total height}}}

so 79 in = total height 

but the question asks for feet 
and there are 12 in in every foot 


so we use {{{79in X 1ft/12in = 6.58 feet}}}  notice here that the inches units cancel out and we are left with feet