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Finding the Fourth Proportional to 439.21, 607.43 and 392.50

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Solution

The fourth proportional to 439.21, 607.43 and 392.50 is: 542.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.21 : 607.43 = 392.50 : x
  2. Step 2: Convert to fraction form
    439.21/607.43 = 392.50/x
  3. Step 3: Cross multiply
    439.21x = 607.43 × 392.50
  4. Step 4: Simplify right side
    439.21x = 238,414.60
  5. Step 5: Solve for x
    x = 238,414.60/439.21
  6. Step 6: Final answer
    x = 542.83

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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.