Finding the Third Proportional to 128 and 148.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128 : 148.25 = 148.25 : x
2. Step 2: Convert to fraction form
   128/148.25 = 148.25/x
3. Step 3: Cross multiply
   128x = 148.25 × 148.25
4. Step 4: Simplify right side
   128x = 21,978.06
5. Step 5: Solve for x
   x = 21,978.06/128
6. Step 6: Final answer
   x = 171.70