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Finding the Third Proportional to 12,912 and 15,856

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Solution

The third proportional to 12,912 and 15,856 is: 19,471.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912 : 15,856 = 15,856 : x
  2. Step 2: Convert to fraction form
    12,912/15,856 = 15,856/x
  3. Step 3: Cross multiply
    12,912x = 15,856 × 15,856
  4. Step 4: Simplify right side
    12,912x = 251,412,736
  5. Step 5: Solve for x
    x = 251,412,736/12,912
  6. Step 6: Final answer
    x = 19,471.25

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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.