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Finding the Third Proportional to 9,861 and 21,543

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Solution

The third proportional to 9,861 and 21,543 is: 47,064.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,861 : 21,543 = 21,543 : x
  2. Step 2: Convert to fraction form
    9,861/21,543 = 21,543/x
  3. Step 3: Cross multiply
    9,861x = 21,543 × 21,543
  4. Step 4: Simplify right side
    9,861x = 464,100,849
  5. Step 5: Solve for x
    x = 464,100,849/9,861
  6. Step 6: Final answer
    x = 47,064.28

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.