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Finding the Fourth Proportional to 128,977.80, 193,481.10 and 40,230.60

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Solution

The fourth proportional to 128,977.80, 193,481.10 and 40,230.60 is: 60,350.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,977.80 : 193,481.10 = 40,230.60 : x
  2. Step 2: Convert to fraction form
    128,977.80/193,481.10 = 40,230.60/x
  3. Step 3: Cross multiply
    128,977.80x = 193,481.10 × 40,230.60
  4. Step 4: Simplify right side
    128,977.80x = 7,783,860,741.66
  5. Step 5: Solve for x
    x = 7,783,860,741.66/128,977.80
  6. Step 6: Final answer
    x = 60,350.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.