Finding the Third Proportional to 78.25 and 118.25

Step by Step Solution

1. Step 1: Write the proportion equation
   78.25 : 118.25 = 118.25 : x
2. Step 2: Convert to fraction form
   78.25/118.25 = 118.25/x
3. Step 3: Cross multiply
   78.25x = 118.25 × 118.25
4. Step 4: Simplify right side
   78.25x = 13,983.06
5. Step 5: Solve for x
   x = 13,983.06/78.25
6. Step 6: Final answer
   x = 178.70