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Finding the Fourth Proportional to 3,909.57, 5,864.14 and 987.90

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Solution

The fourth proportional to 3,909.57, 5,864.14 and 987.90 is: 1,481.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.57 : 5,864.14 = 987.90 : x
  2. Step 2: Convert to fraction form
    3,909.57/5,864.14 = 987.90/x
  3. Step 3: Cross multiply
    3,909.57x = 5,864.14 × 987.90
  4. Step 4: Simplify right side
    3,909.57x = 5,793,183.91
  5. Step 5: Solve for x
    x = 5,793,183.91/3,909.57
  6. Step 6: Final answer
    x = 1,481.80

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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.