Starting from the top left.
(1) The ratio between the surface area of the SF^2= SA small/SA big = t/f=16/64 = 1/4
Thus SF = sqrt(1/4)=1/2 (or 1:2)
(2) SF = sqrt(288/1152)=sqrt(1/4)=1/2 (or 1:2)
(3) SF^3= 896/4802 SF=3rd root( 896/4802)=4/7 (or 4:7)
(4) SF = 3rd toot (5616/26000) = 3/5 or (3:5)
Thank you so much for your help.
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