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Finding the Fourth Proportional to 8,379.55, 12,569.11 and 2,139.58

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Solution

The fourth proportional to 8,379.55, 12,569.11 and 2,139.58 is: 3,209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,379.55 : 12,569.11 = 2,139.58 : x
  2. Step 2: Convert to fraction form
    8,379.55/12,569.11 = 2,139.58/x
  3. Step 3: Cross multiply
    8,379.55x = 12,569.11 × 2,139.58
  4. Step 4: Simplify right side
    8,379.55x = 26,892,616.37
  5. Step 5: Solve for x
    x = 26,892,616.37/8,379.55
  6. Step 6: Final answer
    x = 3,209.32

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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.