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Finding the Fourth Proportional to 5,590.60, 8,387.42 and 4,978.55

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Solution

The fourth proportional to 5,590.60, 8,387.42 and 4,978.55 is: 7,469.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,590.60 : 8,387.42 = 4,978.55 : x
  2. Step 2: Convert to fraction form
    5,590.60/8,387.42 = 4,978.55/x
  3. Step 3: Cross multiply
    5,590.60x = 8,387.42 × 4,978.55
  4. Step 4: Simplify right side
    5,590.60x = 41,757,185.92
  5. Step 5: Solve for x
    x = 41,757,185.92/5,590.60
  6. Step 6: Final answer
    x = 7,469.18

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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.