Finding the Third Proportional to 139.75 and 302.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139.75 : 302.50 = 302.50 : x
2. Step 2: Convert to fraction form
   139.75/302.50 = 302.50/x
3. Step 3: Cross multiply
   139.75x = 302.50 × 302.50
4. Step 4: Simplify right side
   139.75x = 91,506.25
5. Step 5: Solve for x
   x = 91,506.25/139.75
6. Step 6: Final answer
   x = 654.79