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Finding the Fourth Proportional to 139,698.20, 192,810.09 and 79,274.46

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Solution

The fourth proportional to 139,698.20, 192,810.09 and 79,274.46 is: 109,413.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,698.20 : 192,810.09 = 79,274.46 : x
  2. Step 2: Convert to fraction form
    139,698.20/192,810.09 = 79,274.46/x
  3. Step 3: Cross multiply
    139,698.20x = 192,810.09 × 79,274.46
  4. Step 4: Simplify right side
    139,698.20x = 15,284,915,767.30
  5. Step 5: Solve for x
    x = 15,284,915,767.30/139,698.20
  6. Step 6: Final answer
    x = 109,413.83

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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.