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Finding the Fourth Proportional to 139,301.24, 192,242.16 and 78,863.90

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Solution

The fourth proportional to 139,301.24, 192,242.16 and 78,863.90 is: 108,835.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,301.24 : 192,242.16 = 78,863.90 : x
  2. Step 2: Convert to fraction form
    139,301.24/192,242.16 = 78,863.90/x
  3. Step 3: Cross multiply
    139,301.24x = 192,242.16 × 78,863.90
  4. Step 4: Simplify right side
    139,301.24x = 15,160,965,520.81
  5. Step 5: Solve for x
    x = 15,160,965,520.81/139,301.24
  6. Step 6: Final answer
    x = 108,835.83

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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.