Finding the Third Proportional to 19.50 and 20.25

Step by Step Solution

1. Step 1: Write the proportion equation
   19.50 : 20.25 = 20.25 : x
2. Step 2: Convert to fraction form
   19.50/20.25 = 20.25/x
3. Step 3: Cross multiply
   19.50x = 20.25 × 20.25
4. Step 4: Simplify right side
   19.50x = 410.06
5. Step 5: Solve for x
   x = 410.06/19.50
6. Step 6: Final answer
   x = 21.03