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Finding the Third Proportional to 12,920 and 15,864

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Solution

The third proportional to 12,920 and 15,864 is: 19,478.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920 : 15,864 = 15,864 : x
  2. Step 2: Convert to fraction form
    12,920/15,864 = 15,864/x
  3. Step 3: Cross multiply
    12,920x = 15,864 × 15,864
  4. Step 4: Simplify right side
    12,920x = 251,666,496
  5. Step 5: Solve for x
    x = 251,666,496/12,920
  6. Step 6: Final answer
    x = 19,478.83

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.