Finding the Third Proportional to 308.50 and 434.25

Step by Step Solution

1. Step 1: Write the proportion equation
   308.50 : 434.25 = 434.25 : x
2. Step 2: Convert to fraction form
   308.50/434.25 = 434.25/x
3. Step 3: Cross multiply
   308.50x = 434.25 × 434.25
4. Step 4: Simplify right side
   308.50x = 188,573.06
5. Step 5: Solve for x
   x = 188,573.06/308.50
6. Step 6: Final answer
   x = 611.26