Finding the Third Proportional to 142.88 and 253.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142.88 : 253.50 = 253.50 : x
2. Step 2: Convert to fraction form
   142.88/253.50 = 253.50/x
3. Step 3: Cross multiply
   142.88x = 253.50 × 253.50
4. Step 4: Simplify right side
   142.88x = 64,262.25
5. Step 5: Solve for x
   x = 64,262.25/142.88
6. Step 6: Final answer
   x = 449.78