Finding the Third Proportional to 53.25 and 121.31

Step by Step Solution

1. Step 1: Write the proportion equation
   53.25 : 121.31 = 121.31 : x
2. Step 2: Convert to fraction form
   53.25/121.31 = 121.31/x
3. Step 3: Cross multiply
   53.25x = 121.31 × 121.31
4. Step 4: Simplify right side
   53.25x = 14,716.72
5. Step 5: Solve for x
   x = 14,716.72/53.25
6. Step 6: Final answer
   x = 276.37