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Finding the Fourth Proportional to 139,638.08, 192,704.61 and 75,979.97

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Solution

The fourth proportional to 139,638.08, 192,704.61 and 75,979.97 is: 104,854.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,638.08 : 192,704.61 = 75,979.97 : x
  2. Step 2: Convert to fraction form
    139,638.08/192,704.61 = 75,979.97/x
  3. Step 3: Cross multiply
    139,638.08x = 192,704.61 × 75,979.97
  4. Step 4: Simplify right side
    139,638.08x = 14,641,690,486.66
  5. Step 5: Solve for x
    x = 14,641,690,486.66/139,638.08
  6. Step 6: Final answer
    x = 104,854.57

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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.