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Finding the Third Proportional to 15,439 and 21,861

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Solution

The third proportional to 15,439 and 21,861 is: 30,954.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,439 : 21,861 = 21,861 : x
  2. Step 2: Convert to fraction form
    15,439/21,861 = 21,861/x
  3. Step 3: Cross multiply
    15,439x = 21,861 × 21,861
  4. Step 4: Simplify right side
    15,439x = 477,903,321
  5. Step 5: Solve for x
    x = 477,903,321/15,439
  6. Step 6: Final answer
    x = 30,954.29

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.