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Finding the Fourth Proportional to 20,092, 30,138 and 7,780

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Solution

The fourth proportional to 20,092, 30,138 and 7,780 is: 11,670

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,092 : 30,138 = 7,780 : x
  2. Step 2: Convert to fraction form
    20,092/30,138 = 7,780/x
  3. Step 3: Cross multiply
    20,092x = 30,138 × 7,780
  4. Step 4: Simplify right side
    20,092x = 234,473,640
  5. Step 5: Solve for x
    x = 234,473,640/20,092
  6. Step 6: Final answer
    x = 11,670

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.