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Finding the Fourth Proportional to 624,717.20, 861,757.80 and 395,203.28

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Solution

The fourth proportional to 624,717.20, 861,757.80 and 395,203.28 is: 545,157.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    624,717.20 : 861,757.80 = 395,203.28 : x
  2. Step 2: Convert to fraction form
    624,717.20/861,757.80 = 395,203.28/x
  3. Step 3: Cross multiply
    624,717.20x = 861,757.80 × 395,203.28
  4. Step 4: Simplify right side
    624,717.20x = 340,569,509,125.58
  5. Step 5: Solve for x
    x = 340,569,509,125.58/624,717.20
  6. Step 6: Final answer
    x = 545,157.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.