Multiply with Formula to the existing cell values

Hi,

I need to multiply the values of particular row with other row with formula link.

Example values of 4th row to be multiply with row 2 & 3 with formula like in A2 cell "=A2 cell value * A4"

If i change the value of A4, A2 & A3 also should change accordingly.

I have attached excel workbook with sample data.

Request you to help with VBA code.