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Finding the Fourth Proportional to 139,704.40, 192,782.19 and 76,040.83

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Solution

The fourth proportional to 139,704.40, 192,782.19 and 76,040.83 is: 104,930.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,704.40 : 192,782.19 = 76,040.83 : x
  2. Step 2: Convert to fraction form
    139,704.40/192,782.19 = 76,040.83/x
  3. Step 3: Cross multiply
    139,704.40x = 192,782.19 × 76,040.83
  4. Step 4: Simplify right side
    139,704.40x = 14,659,317,736.82
  5. Step 5: Solve for x
    x = 14,659,317,736.82/139,704.40
  6. Step 6: Final answer
    x = 104,930.97

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Why These Related Problems?

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