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Finding the Third Proportional to 20,439 and 28,146

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Solution

The third proportional to 20,439 and 28,146 is: 38,759.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439 : 28,146 = 28,146 : x
  2. Step 2: Convert to fraction form
    20,439/28,146 = 28,146/x
  3. Step 3: Cross multiply
    20,439x = 28,146 × 28,146
  4. Step 4: Simplify right side
    20,439x = 792,197,316
  5. Step 5: Solve for x
    x = 792,197,316/20,439
  6. Step 6: Final answer
    x = 38,759.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.