Finding the Third Proportional to 308.81 and 445.50

Step by Step Solution

1. Step 1: Write the proportion equation
   308.81 : 445.50 = 445.50 : x
2. Step 2: Convert to fraction form
   308.81/445.50 = 445.50/x
3. Step 3: Cross multiply
   308.81x = 445.50 × 445.50
4. Step 4: Simplify right side
   308.81x = 198,470.25
5. Step 5: Solve for x
   x = 198,470.25/308.81
6. Step 6: Final answer
   x = 642.69