Finding the Third Proportional to 279.75 and 388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   279.75 : 388.50 = 388.50 : x
2. Step 2: Convert to fraction form
   279.75/388.50 = 388.50/x
3. Step 3: Cross multiply
   279.75x = 388.50 × 388.50
4. Step 4: Simplify right side
   279.75x = 150,932.25
5. Step 5: Solve for x
   x = 150,932.25/279.75
6. Step 6: Final answer
   x = 539.53