Finding the Third Proportional to 139.50 and 206.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139.50 : 206.25 = 206.25 : x
2. Step 2: Convert to fraction form
   139.50/206.25 = 206.25/x
3. Step 3: Cross multiply
   139.50x = 206.25 × 206.25
4. Step 4: Simplify right side
   139.50x = 42,539.06
5. Step 5: Solve for x
   x = 42,539.06/139.50
6. Step 6: Final answer
   x = 304.94