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Finding the Fourth Proportional to 139,201.06, 192,094.76 and 78,770.60

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Solution

The fourth proportional to 139,201.06, 192,094.76 and 78,770.60 is: 108,701.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,201.06 : 192,094.76 = 78,770.60 : x
  2. Step 2: Convert to fraction form
    139,201.06/192,094.76 = 78,770.60/x
  3. Step 3: Cross multiply
    139,201.06x = 192,094.76 × 78,770.60
  4. Step 4: Simplify right side
    139,201.06x = 15,131,419,502.06
  5. Step 5: Solve for x
    x = 15,131,419,502.06/139,201.06
  6. Step 6: Final answer
    x = 108,701.90

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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.