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Finding the Third Proportional to 8,921 and 13,859

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Solution

The third proportional to 8,921 and 13,859 is: 21,530.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921 : 13,859 = 13,859 : x
  2. Step 2: Convert to fraction form
    8,921/13,859 = 13,859/x
  3. Step 3: Cross multiply
    8,921x = 13,859 × 13,859
  4. Step 4: Simplify right side
    8,921x = 192,071,881
  5. Step 5: Solve for x
    x = 192,071,881/8,921
  6. Step 6: Final answer
    x = 21,530.31

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.