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Finding the Fourth Proportional to 8,589, 12,885.42 and 3,117

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Solution

The fourth proportional to 8,589, 12,885.42 and 3,117 is: 4,676.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,589 : 12,885.42 = 3,117 : x
  2. Step 2: Convert to fraction form
    8,589/12,885.42 = 3,117/x
  3. Step 3: Cross multiply
    8,589x = 12,885.42 × 3,117
  4. Step 4: Simplify right side
    8,589x = 40,163,854.14
  5. Step 5: Solve for x
    x = 40,163,854.14/8,589
  6. Step 6: Final answer
    x = 4,676.20

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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.