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Finding the Fourth Proportional to 457.20, 686.39 and 392.62

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Solution

The fourth proportional to 457.20, 686.39 and 392.62 is: 589.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.20 : 686.39 = 392.62 : x
  2. Step 2: Convert to fraction form
    457.20/686.39 = 392.62/x
  3. Step 3: Cross multiply
    457.20x = 686.39 × 392.62
  4. Step 4: Simplify right side
    457.20x = 269,490.44
  5. Step 5: Solve for x
    x = 269,490.44/457.20
  6. Step 6: Final answer
    x = 589.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.