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Finding the Third Proportional to 3,894 and 8,139

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Solution

The third proportional to 3,894 and 8,139 is: 17,011.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,894 : 8,139 = 8,139 : x
  2. Step 2: Convert to fraction form
    3,894/8,139 = 8,139/x
  3. Step 3: Cross multiply
    3,894x = 8,139 × 8,139
  4. Step 4: Simplify right side
    3,894x = 66,243,321
  5. Step 5: Solve for x
    x = 66,243,321/3,894
  6. Step 6: Final answer
    x = 17,011.64

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.