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Finding the Third Proportional to 12,936 and 19,780

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Solution

The third proportional to 12,936 and 19,780 is: 30,244.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,936 : 19,780 = 19,780 : x
  2. Step 2: Convert to fraction form
    12,936/19,780 = 19,780/x
  3. Step 3: Cross multiply
    12,936x = 19,780 × 19,780
  4. Step 4: Simplify right side
    12,936x = 391,248,400
  5. Step 5: Solve for x
    x = 391,248,400/12,936
  6. Step 6: Final answer
    x = 30,244.93

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.