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Finding the Fourth Proportional to 8,609.65, 12,921.39 and 4,450.87

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Solution

The fourth proportional to 8,609.65, 12,921.39 and 4,450.87 is: 6,679.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,609.65 : 12,921.39 = 4,450.87 : x
  2. Step 2: Convert to fraction form
    8,609.65/12,921.39 = 4,450.87/x
  3. Step 3: Cross multiply
    8,609.65x = 12,921.39 × 4,450.87
  4. Step 4: Simplify right side
    8,609.65x = 57,511,340.25
  5. Step 5: Solve for x
    x = 57,511,340.25/8,609.65
  6. Step 6: Final answer
    x = 6,679.87

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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.