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Finding the Third Proportional to 18,722 and 28,155

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Solution

The third proportional to 18,722 and 28,155 is: 42,340.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722 : 28,155 = 28,155 : x
  2. Step 2: Convert to fraction form
    18,722/28,155 = 28,155/x
  3. Step 3: Cross multiply
    18,722x = 28,155 × 28,155
  4. Step 4: Simplify right side
    18,722x = 792,704,025
  5. Step 5: Solve for x
    x = 792,704,025/18,722
  6. Step 6: Final answer
    x = 42,340.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.