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Finding the Fourth Proportional to 8,469.32, 12,712.18 and 4,089.86

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Solution

The fourth proportional to 8,469.32, 12,712.18 and 4,089.86 is: 6,138.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,469.32 : 12,712.18 = 4,089.86 : x
  2. Step 2: Convert to fraction form
    8,469.32/12,712.18 = 4,089.86/x
  3. Step 3: Cross multiply
    8,469.32x = 12,712.18 × 4,089.86
  4. Step 4: Simplify right side
    8,469.32x = 51,991,036.49
  5. Step 5: Solve for x
    x = 51,991,036.49/8,469.32
  6. Step 6: Final answer
    x = 6,138.75

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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.