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Finding the Fourth Proportional to 20,093, 30,139.50 and 7,781

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Solution

The fourth proportional to 20,093, 30,139.50 and 7,781 is: 11,671.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,093 : 30,139.50 = 7,781 : x
  2. Step 2: Convert to fraction form
    20,093/30,139.50 = 7,781/x
  3. Step 3: Cross multiply
    20,093x = 30,139.50 × 7,781
  4. Step 4: Simplify right side
    20,093x = 234,515,449.50
  5. Step 5: Solve for x
    x = 234,515,449.50/20,093
  6. Step 6: Final answer
    x = 11,671.50

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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.