Finding the Third Proportional to 143.25 and 245.25

Step by Step Solution

1. Step 1: Write the proportion equation
   143.25 : 245.25 = 245.25 : x
2. Step 2: Convert to fraction form
   143.25/245.25 = 245.25/x
3. Step 3: Cross multiply
   143.25x = 245.25 × 245.25
4. Step 4: Simplify right side
   143.25x = 60,147.56
5. Step 5: Solve for x
   x = 60,147.56/143.25
6. Step 6: Final answer
   x = 419.88