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Finding the Fourth Proportional to 681, 1,019.87 and 391.83

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Solution

The fourth proportional to 681, 1,019.87 and 391.83 is: 586.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    681 : 1,019.87 = 391.83 : x
  2. Step 2: Convert to fraction form
    681/1,019.87 = 391.83/x
  3. Step 3: Cross multiply
    681x = 1,019.87 × 391.83
  4. Step 4: Simplify right side
    681x = 399,616.64
  5. Step 5: Solve for x
    x = 399,616.64/681
  6. Step 6: Final answer
    x = 586.81

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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.