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Finding the Third Proportional to 15,938 and 21,859

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Solution

The third proportional to 15,938 and 21,859 is: 29,979.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,938 : 21,859 = 21,859 : x
  2. Step 2: Convert to fraction form
    15,938/21,859 = 21,859/x
  3. Step 3: Cross multiply
    15,938x = 21,859 × 21,859
  4. Step 4: Simplify right side
    15,938x = 477,815,881
  5. Step 5: Solve for x
    x = 477,815,881/15,938
  6. Step 6: Final answer
    x = 29,979.66

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.