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Finding the Third Proportional to 15,513 and 21,879

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Solution

The third proportional to 15,513 and 21,879 is: 30,857.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,513 : 21,879 = 21,879 : x
  2. Step 2: Convert to fraction form
    15,513/21,879 = 21,879/x
  3. Step 3: Cross multiply
    15,513x = 21,879 × 21,879
  4. Step 4: Simplify right side
    15,513x = 478,690,641
  5. Step 5: Solve for x
    x = 478,690,641/15,513
  6. Step 6: Final answer
    x = 30,857.39

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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.