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Finding the Third Proportional to 11,780 and 15,678

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Solution

The third proportional to 11,780 and 15,678 is: 20,865.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,780 : 15,678 = 15,678 : x
  2. Step 2: Convert to fraction form
    11,780/15,678 = 15,678/x
  3. Step 3: Cross multiply
    11,780x = 15,678 × 15,678
  4. Step 4: Simplify right side
    11,780x = 245,799,684
  5. Step 5: Solve for x
    x = 245,799,684/11,780
  6. Step 6: Final answer
    x = 20,865.85

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.