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Finding the Third Proportional to 103,689 and 213,920

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Solution

The third proportional to 103,689 and 213,920 is: 441,336.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689 : 213,920 = 213,920 : x
  2. Step 2: Convert to fraction form
    103,689/213,920 = 213,920/x
  3. Step 3: Cross multiply
    103,689x = 213,920 × 213,920
  4. Step 4: Simplify right side
    103,689x = 45,761,766,400
  5. Step 5: Solve for x
    x = 45,761,766,400/103,689
  6. Step 6: Final answer
    x = 441,336.75

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.