#### Answer

a) 2 and 3
b) 1 and 6
c) 6
d) 6

#### Work Step by Step

If we have proportion in the form of $\frac{a}{b}$= $\frac{c}{d}$ which is equivalent to a:b =c:d
Given, proportion $\frac{1}{2}$ = $\frac{3}{6}$
a) Means of a proportion is b and c. So for the given proportion means are 2 and 3
b.) Extremes of the proportion are a and d. So extremes of a given proportion are 1 and 6
c)the product of means is bc
So product of means of a given proportion are 2.3 = 6
d.) the product of extremes is ad
So product of extremes of a given proportion is 1.6 = 6