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Finding the Fourth Proportional to 139,425.26, 192,391.24 and 78,982.96

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Solution

The fourth proportional to 139,425.26, 192,391.24 and 78,982.96 is: 108,987.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,425.26 : 192,391.24 = 78,982.96 : x
  2. Step 2: Convert to fraction form
    139,425.26/192,391.24 = 78,982.96/x
  3. Step 3: Cross multiply
    139,425.26x = 192,391.24 × 78,982.96
  4. Step 4: Simplify right side
    139,425.26x = 15,195,629,613.27
  5. Step 5: Solve for x
    x = 15,195,629,613.27/139,425.26
  6. Step 6: Final answer
    x = 108,987.64

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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.