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Finding the Third Proportional to 15,678 and 21,293

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Solution

The third proportional to 15,678 and 21,293 is: 28,918.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,678 : 21,293 = 21,293 : x
  2. Step 2: Convert to fraction form
    15,678/21,293 = 21,293/x
  3. Step 3: Cross multiply
    15,678x = 21,293 × 21,293
  4. Step 4: Simplify right side
    15,678x = 453,391,849
  5. Step 5: Solve for x
    x = 453,391,849/15,678
  6. Step 6: Final answer
    x = 28,918.99

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.