Question

Four sizes of scaled text are shown.

Answer 1

Let
x--------> the unknown scale size

we know that

N 1---------> 2.618
N 2---------> x
N 3---------> 1
N 4---------> 0.618

to obtain the size N 4 ----> multiply the size N 3 by 0.618
so
to obtain  the size N 2 ----> multiply the size N 1 by 0.618
size N 2=2.618*0.618------> 1.6179
x=1.618

the answer is
 the unknown scale size is 1.618