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Finding the Fourth Proportional to 139,481.77, 192,493.79 and 78,233.71

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Solution

The fourth proportional to 139,481.77, 192,493.79 and 78,233.71 is: 107,967.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,481.77 : 192,493.79 = 78,233.71 : x
  2. Step 2: Convert to fraction form
    139,481.77/192,493.79 = 78,233.71/x
  3. Step 3: Cross multiply
    139,481.77x = 192,493.79 × 78,233.71
  4. Step 4: Simplify right side
    139,481.77x = 15,059,503,343.66
  5. Step 5: Solve for x
    x = 15,059,503,343.66/139,481.77
  6. Step 6: Final answer
    x = 107,967.54

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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.