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Finding the Fourth Proportional to 139,394.83, 192,374.38 and 78,965.97

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Solution

The fourth proportional to 139,394.83, 192,374.38 and 78,965.97 is: 108,978.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,394.83 : 192,374.38 = 78,965.97 : x
  2. Step 2: Convert to fraction form
    139,394.83/192,374.38 = 78,965.97/x
  3. Step 3: Cross multiply
    139,394.83x = 192,374.38 × 78,965.97
  4. Step 4: Simplify right side
    139,394.83x = 15,191,029,519.85
  5. Step 5: Solve for x
    x = 15,191,029,519.85/139,394.83
  6. Step 6: Final answer
    x = 108,978.43

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1.5x scale

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.