Answer:
3 and 60
Explanation:
A proportion is a mathematical expression in which two ratios are shown to be equal.
Hence
is proportion .
it can be also written as a:b= c:d
The four part a,b,c,d can be divided into two groups
- means : b and c are means
- extremes: a and d are extremes
based on above discussion
in proportion 3/15=12/60
3 is in position of a
and
60 is in position of d
Thus, 3 and 60 are extremes in 3/15=12/60 proportion.