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Finding the Third Proportional to 20,388 and 28,711

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Solution

The third proportional to 20,388 and 28,711 is: 40,431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388 : 28,711 = 28,711 : x
  2. Step 2: Convert to fraction form
    20,388/28,711 = 28,711/x
  3. Step 3: Cross multiply
    20,388x = 28,711 × 28,711
  4. Step 4: Simplify right side
    20,388x = 824,321,521
  5. Step 5: Solve for x
    x = 824,321,521/20,388
  6. Step 6: Final answer
    x = 40,431.70

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.