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Finding the Fourth Proportional to 6,429.87, 9,638.21 and 3,138.92

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Solution

The fourth proportional to 6,429.87, 9,638.21 and 3,138.92 is: 4,705.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,429.87 : 9,638.21 = 3,138.92 : x
  2. Step 2: Convert to fraction form
    6,429.87/9,638.21 = 3,138.92/x
  3. Step 3: Cross multiply
    6,429.87x = 9,638.21 × 3,138.92
  4. Step 4: Simplify right side
    6,429.87x = 30,253,506.25
  5. Step 5: Solve for x
    x = 30,253,506.25/6,429.87
  6. Step 6: Final answer
    x = 4,705.15

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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.