Finding the Third Proportional to 128.75 and 181.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128.75 : 181.38 = 181.38 : x
2. Step 2: Convert to fraction form
   128.75/181.38 = 181.38/x
3. Step 3: Cross multiply
   128.75x = 181.38 × 181.38
4. Step 4: Simplify right side
   128.75x = 32,896.89
5. Step 5: Solve for x
   x = 32,896.89/128.75
6. Step 6: Final answer
   x = 255.51