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Finding the Fourth Proportional to 3,979.78, 5,489.83 and 2,485.87

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Solution

The fourth proportional to 3,979.78, 5,489.83 and 2,485.87 is: 3,429.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.78 : 5,489.83 = 2,485.87 : x
  2. Step 2: Convert to fraction form
    3,979.78/5,489.83 = 2,485.87/x
  3. Step 3: Cross multiply
    3,979.78x = 5,489.83 × 2,485.87
  4. Step 4: Simplify right side
    3,979.78x = 13,647,003.70
  5. Step 5: Solve for x
    x = 13,647,003.70/3,979.78
  6. Step 6: Final answer
    x = 3,429.08

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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.