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Finding the Fourth Proportional to 528.12, 791.91 and 425.61

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Solution

The fourth proportional to 528.12, 791.91 and 425.61 is: 638.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.12 : 791.91 = 425.61 : x
  2. Step 2: Convert to fraction form
    528.12/791.91 = 425.61/x
  3. Step 3: Cross multiply
    528.12x = 791.91 × 425.61
  4. Step 4: Simplify right side
    528.12x = 337,044.82
  5. Step 5: Solve for x
    x = 337,044.82/528.12
  6. Step 6: Final answer
    x = 638.20

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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.