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Finding the Fourth Proportional to 627.20, 940.08 and 261.80

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Solution

The fourth proportional to 627.20, 940.08 and 261.80 is: 392.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.20 : 940.08 = 261.80 : x
  2. Step 2: Convert to fraction form
    627.20/940.08 = 261.80/x
  3. Step 3: Cross multiply
    627.20x = 940.08 × 261.80
  4. Step 4: Simplify right side
    627.20x = 246,112.94
  5. Step 5: Solve for x
    x = 246,112.94/627.20
  6. Step 6: Final answer
    x = 392.40

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