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Finding the Third Proportional to 11,780 and 18,390

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Solution

The third proportional to 11,780 and 18,390 is: 28,709.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,780 : 18,390 = 18,390 : x
  2. Step 2: Convert to fraction form
    11,780/18,390 = 18,390/x
  3. Step 3: Cross multiply
    11,780x = 18,390 × 18,390
  4. Step 4: Simplify right side
    11,780x = 338,192,100
  5. Step 5: Solve for x
    x = 338,192,100/11,780
  6. Step 6: Final answer
    x = 28,709.01

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.