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Finding the Fourth Proportional to 139,392.39, 192,371.01 and 78,963.54

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Solution

The fourth proportional to 139,392.39, 192,371.01 and 78,963.54 is: 108,975.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,392.39 : 192,371.01 = 78,963.54 : x
  2. Step 2: Convert to fraction form
    139,392.39/192,371.01 = 78,963.54/x
  3. Step 3: Cross multiply
    139,392.39x = 192,371.01 × 78,963.54
  4. Step 4: Simplify right side
    139,392.39x = 15,190,295,942.98
  5. Step 5: Solve for x
    x = 15,190,295,942.98/139,392.39
  6. Step 6: Final answer
    x = 108,975.07

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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.