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Finding the Fourth Proportional to 139,235.38, 192,099.09 and 78,800.02

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Solution

The fourth proportional to 139,235.38, 192,099.09 and 78,800.02 is: 108,718.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,235.38 : 192,099.09 = 78,800.02 : x
  2. Step 2: Convert to fraction form
    139,235.38/192,099.09 = 78,800.02/x
  3. Step 3: Cross multiply
    139,235.38x = 192,099.09 × 78,800.02
  4. Step 4: Simplify right side
    139,235.38x = 15,137,412,133.98
  5. Step 5: Solve for x
    x = 15,137,412,133.98/139,235.38
  6. Step 6: Final answer
    x = 108,718.14

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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.