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Finding the Third Proportional to 19,920 and 27,921

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Solution

The third proportional to 19,920 and 27,921 is: 39,135.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920 : 27,921 = 27,921 : x
  2. Step 2: Convert to fraction form
    19,920/27,921 = 27,921/x
  3. Step 3: Cross multiply
    19,920x = 27,921 × 27,921
  4. Step 4: Simplify right side
    19,920x = 779,582,241
  5. Step 5: Solve for x
    x = 779,582,241/19,920
  6. Step 6: Final answer
    x = 39,135.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.