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Finding the Third Proportional to 7,872 and 12,861

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Solution

The third proportional to 7,872 and 12,861 is: 21,011.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,872 : 12,861 = 12,861 : x
  2. Step 2: Convert to fraction form
    7,872/12,861 = 12,861/x
  3. Step 3: Cross multiply
    7,872x = 12,861 × 12,861
  4. Step 4: Simplify right side
    7,872x = 165,405,321
  5. Step 5: Solve for x
    x = 165,405,321/7,872
  6. Step 6: Final answer
    x = 21,011.85

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.