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Finding the Fourth Proportional to 139,404.68, 192,372.18 and 78,974.09

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Solution

The fourth proportional to 139,404.68, 192,372.18 and 78,974.09 is: 108,980.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,404.68 : 192,372.18 = 78,974.09 : x
  2. Step 2: Convert to fraction form
    139,404.68/192,372.18 = 78,974.09/x
  3. Step 3: Cross multiply
    139,404.68x = 192,372.18 × 78,974.09
  4. Step 4: Simplify right side
    139,404.68x = 15,192,417,856.82
  5. Step 5: Solve for x
    x = 15,192,417,856.82/139,404.68
  6. Step 6: Final answer
    x = 108,980.69

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.