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Finding the Fourth Proportional to 128,836.40, 193,350.60 and 66,474.80

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Solution

The fourth proportional to 128,836.40, 193,350.60 and 66,474.80 is: 99,761.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,836.40 : 193,350.60 = 66,474.80 : x
  2. Step 2: Convert to fraction form
    128,836.40/193,350.60 = 66,474.80/x
  3. Step 3: Cross multiply
    128,836.40x = 193,350.60 × 66,474.80
  4. Step 4: Simplify right side
    128,836.40x = 12,852,942,464.88
  5. Step 5: Solve for x
    x = 12,852,942,464.88/128,836.40
  6. Step 6: Final answer
    x = 99,761.73

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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.