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Finding the Third Proportional to 9,879 and 21,217

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Solution

The third proportional to 9,879 and 21,217 is: 45,567.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,879 : 21,217 = 21,217 : x
  2. Step 2: Convert to fraction form
    9,879/21,217 = 21,217/x
  3. Step 3: Cross multiply
    9,879x = 21,217 × 21,217
  4. Step 4: Simplify right side
    9,879x = 450,161,089
  5. Step 5: Solve for x
    x = 450,161,089/9,879
  6. Step 6: Final answer
    x = 45,567.48

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.