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Finding the Third Proportional to 61,931 and 86,172

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Solution

The third proportional to 61,931 and 86,172 is: 119,901.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,931 : 86,172 = 86,172 : x
  2. Step 2: Convert to fraction form
    61,931/86,172 = 86,172/x
  3. Step 3: Cross multiply
    61,931x = 86,172 × 86,172
  4. Step 4: Simplify right side
    61,931x = 7,425,613,584
  5. Step 5: Solve for x
    x = 7,425,613,584/61,931
  6. Step 6: Final answer
    x = 119,901.40

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.