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Finding the Fourth Proportional to 139,616.13, 192,680.78 and 85,163.41

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Solution

The fourth proportional to 139,616.13, 192,680.78 and 85,163.41 is: 117,531.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,616.13 : 192,680.78 = 85,163.41 : x
  2. Step 2: Convert to fraction form
    139,616.13/192,680.78 = 85,163.41/x
  3. Step 3: Cross multiply
    139,616.13x = 192,680.78 × 85,163.41
  4. Step 4: Simplify right side
    139,616.13x = 16,409,353,201.72
  5. Step 5: Solve for x
    x = 16,409,353,201.72/139,616.13
  6. Step 6: Final answer
    x = 117,531.93

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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.