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Finding the Third Proportional to 19,911 and 30,911

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Solution

The third proportional to 19,911 and 30,911 is: 47,988.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,911 : 30,911 = 30,911 : x
  2. Step 2: Convert to fraction form
    19,911/30,911 = 30,911/x
  3. Step 3: Cross multiply
    19,911x = 30,911 × 30,911
  4. Step 4: Simplify right side
    19,911x = 955,489,921
  5. Step 5: Solve for x
    x = 955,489,921/19,911
  6. Step 6: Final answer
    x = 47,988.04

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.