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Finding the Fourth Proportional to 686.62, 1,027.92 and 616.25

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Solution

The fourth proportional to 686.62, 1,027.92 and 616.25 is: 922.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.62 : 1,027.92 = 616.25 : x
  2. Step 2: Convert to fraction form
    686.62/1,027.92 = 616.25/x
  3. Step 3: Cross multiply
    686.62x = 1,027.92 × 616.25
  4. Step 4: Simplify right side
    686.62x = 633,454.80
  5. Step 5: Solve for x
    x = 633,454.80/686.62
  6. Step 6: Final answer
    x = 922.58

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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.