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Finding the Third Proportional to 12,776 and 19,831

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Solution

The third proportional to 12,776 and 19,831 is: 30,781.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,776 : 19,831 = 19,831 : x
  2. Step 2: Convert to fraction form
    12,776/19,831 = 19,831/x
  3. Step 3: Cross multiply
    12,776x = 19,831 × 19,831
  4. Step 4: Simplify right side
    12,776x = 393,268,561
  5. Step 5: Solve for x
    x = 393,268,561/12,776
  6. Step 6: Final answer
    x = 30,781.82

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.