Question

show that 3.6, 1.8 and 0.9 are in continued proportion

Answer 1

hey mate
here's the solution

Answer 2

The third proportional of two numbers a and b is defined to be that number c such that a : b = b : c.

So you want to find a number c such that 12 : 18 = 18 : c. That number is 27.

If BD = AC, then the 3rd proportional to AB and AC is CE.