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Finding the Fourth Proportional to 18,956, 28,434 and 5,105

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Solution

The fourth proportional to 18,956, 28,434 and 5,105 is: 7,657.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956 : 28,434 = 5,105 : x
  2. Step 2: Convert to fraction form
    18,956/28,434 = 5,105/x
  3. Step 3: Cross multiply
    18,956x = 28,434 × 5,105
  4. Step 4: Simplify right side
    18,956x = 145,155,570
  5. Step 5: Solve for x
    x = 145,155,570/18,956
  6. Step 6: Final answer
    x = 7,657.50

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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.