Verified answer

Answer:

36

Step-by-step explanation:

Mark me as brainlist and follow.me✨

Step-by-step explanation:

if a:b is in proportion then it is a:b::b:c

here,

a and b is 4:12

so,

4:12::12:c

4×c= 12×12

4c= 144

c= 36

hence third proportion is 36

#666