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Finding the Third Proportional to 17,919 and 39,417

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Solution

The third proportional to 17,919 and 39,417 is: 86,706.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,919 : 39,417 = 39,417 : x
  2. Step 2: Convert to fraction form
    17,919/39,417 = 39,417/x
  3. Step 3: Cross multiply
    17,919x = 39,417 × 39,417
  4. Step 4: Simplify right side
    17,919x = 1,553,699,889
  5. Step 5: Solve for x
    x = 1,553,699,889/17,919
  6. Step 6: Final answer
    x = 86,706.84

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.