Finding the Third Proportional to 211.50 and 307.50

Step by Step Solution

1. Step 1: Write the proportion equation
   211.50 : 307.50 = 307.50 : x
2. Step 2: Convert to fraction form
   211.50/307.50 = 307.50/x
3. Step 3: Cross multiply
   211.50x = 307.50 × 307.50
4. Step 4: Simplify right side
   211.50x = 94,556.25
5. Step 5: Solve for x
   x = 94,556.25/211.50
6. Step 6: Final answer
   x = 447.07