Finding the Third Proportional to 200.25 and 289.50

Step by Step Solution

1. Step 1: Write the proportion equation
   200.25 : 289.50 = 289.50 : x
2. Step 2: Convert to fraction form
   200.25/289.50 = 289.50/x
3. Step 3: Cross multiply
   200.25x = 289.50 × 289.50
4. Step 4: Simplify right side
   200.25x = 83,810.25
5. Step 5: Solve for x
   x = 83,810.25/200.25
6. Step 6: Final answer
   x = 418.53