Finding the Third Proportional to 99.75 and 212.25

Step by Step Solution

1. Step 1: Write the proportion equation
   99.75 : 212.25 = 212.25 : x
2. Step 2: Convert to fraction form
   99.75/212.25 = 212.25/x
3. Step 3: Cross multiply
   99.75x = 212.25 × 212.25
4. Step 4: Simplify right side
   99.75x = 45,050.06
5. Step 5: Solve for x
   x = 45,050.06/99.75
6. Step 6: Final answer
   x = 451.63