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Finding the Fourth Proportional to 686.72, 1,029.14 and 339.52

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Solution

The fourth proportional to 686.72, 1,029.14 and 339.52 is: 508.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.72 : 1,029.14 = 339.52 : x
  2. Step 2: Convert to fraction form
    686.72/1,029.14 = 339.52/x
  3. Step 3: Cross multiply
    686.72x = 1,029.14 × 339.52
  4. Step 4: Simplify right side
    686.72x = 349,413.61
  5. Step 5: Solve for x
    x = 349,413.61/686.72
  6. Step 6: Final answer
    x = 508.82

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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.