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Finding the Fourth Proportional to 616.20, 861.60 and 616.20

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Solution

The fourth proportional to 616.20, 861.60 and 616.20 is: 861.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.20 : 861.60 = 616.20 : x
  2. Step 2: Convert to fraction form
    616.20/861.60 = 616.20/x
  3. Step 3: Cross multiply
    616.20x = 861.60 × 616.20
  4. Step 4: Simplify right side
    616.20x = 530,917.92
  5. Step 5: Solve for x
    x = 530,917.92/616.20
  6. Step 6: Final answer
    x = 861.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.