Finding the Third Proportional to 78.75 and 164.25

Step by Step Solution

1. Step 1: Write the proportion equation
   78.75 : 164.25 = 164.25 : x
2. Step 2: Convert to fraction form
   78.75/164.25 = 164.25/x
3. Step 3: Cross multiply
   78.75x = 164.25 × 164.25
4. Step 4: Simplify right side
   78.75x = 26,978.06
5. Step 5: Solve for x
   x = 26,978.06/78.75
6. Step 6: Final answer
   x = 342.58