 Hello all and welcome to the session. Today the question is, find the name proportional between 18 and 8. Now before starting this question, we should know about the result of a proportion. And that is if A, B, C are in continuous proportion, then A is to B is equal to B is to C. And we also know that product of means is equal to product of experience where these two terms are called the means and these two terms are called the experience. Therefore product of means will be B into B that is B square is equal to product of extreme that is A into C. So this gives B square is equal to AC. This implies B is equal to square root of AC. Therefore B is called the mean proportional between A and C. So this will work as a key idea for solving out this question. Now let us start with the solution. The mean proportional between 18 and 8 according to the formula which is given in the key idea will be equal to square root of 18 into 8 which is equal to square root of 18 into 8 is 144 which is equal to 12 as the square root of 144 is 12. Therefore the mean proportional between 18 and 8 is 12. So this is the solution for the given question and that is all for this session. Hope you all have enjoyed this session.