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Finding the Fourth Proportional to 139,538.70, 192,559.41 and 79,115.13

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Solution

The fourth proportional to 139,538.70, 192,559.41 and 79,115.13 is: 109,176.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,538.70 : 192,559.41 = 79,115.13 : x
  2. Step 2: Convert to fraction form
    139,538.70/192,559.41 = 79,115.13/x
  3. Step 3: Cross multiply
    139,538.70x = 192,559.41 × 79,115.13
  4. Step 4: Simplify right side
    139,538.70x = 15,234,362,754.87
  5. Step 5: Solve for x
    x = 15,234,362,754.87/139,538.70
  6. Step 6: Final answer
    x = 109,176.61

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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.