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Finding the Third Proportional to 21,872 and 31,957

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Solution

The third proportional to 21,872 and 31,957 is: 46,692.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,872 : 31,957 = 31,957 : x
  2. Step 2: Convert to fraction form
    21,872/31,957 = 31,957/x
  3. Step 3: Cross multiply
    21,872x = 31,957 × 31,957
  4. Step 4: Simplify right side
    21,872x = 1,021,249,849
  5. Step 5: Solve for x
    x = 1,021,249,849/21,872
  6. Step 6: Final answer
    x = 46,692.11

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.