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Finding the Fourth Proportional to 3,607.96, 4,978.87 and 2,115.85

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Solution

The fourth proportional to 3,607.96, 4,978.87 and 2,115.85 is: 2,919.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,607.96 : 4,978.87 = 2,115.85 : x
  2. Step 2: Convert to fraction form
    3,607.96/4,978.87 = 2,115.85/x
  3. Step 3: Cross multiply
    3,607.96x = 4,978.87 × 2,115.85
  4. Step 4: Simplify right side
    3,607.96x = 10,534,542.09
  5. Step 5: Solve for x
    x = 10,534,542.09/3,607.96
  6. Step 6: Final answer
    x = 2,919.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.