Finding the Third Proportional to 200.72 and 311.48

Step by Step Solution

1. Step 1: Write the proportion equation
   200.72 : 311.48 = 311.48 : x
2. Step 2: Convert to fraction form
   200.72/311.48 = 311.48/x
3. Step 3: Cross multiply
   200.72x = 311.48 × 311.48
4. Step 4: Simplify right side
   200.72x = 97,022.52
5. Step 5: Solve for x
   x = 97,022.52/200.72
6. Step 6: Final answer
   x = 483.38