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Finding the Fourth Proportional to 619.76, 861.20 and 613.02

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Solution

The fourth proportional to 619.76, 861.20 and 613.02 is: 851.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.76 : 861.20 = 613.02 : x
  2. Step 2: Convert to fraction form
    619.76/861.20 = 613.02/x
  3. Step 3: Cross multiply
    619.76x = 861.20 × 613.02
  4. Step 4: Simplify right side
    619.76x = 527,932.82
  5. Step 5: Solve for x
    x = 527,932.82/619.76
  6. Step 6: Final answer
    x = 851.83

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.