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Finding the Fourth Proportional to 128,990.73, 193,541.54 and 66,704.97

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Solution

The fourth proportional to 128,990.73, 193,541.54 and 66,704.97 is: 100,086.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.73 : 193,541.54 = 66,704.97 : x
  2. Step 2: Convert to fraction form
    128,990.73/193,541.54 = 66,704.97/x
  3. Step 3: Cross multiply
    128,990.73x = 193,541.54 × 66,704.97
  4. Step 4: Simplify right side
    128,990.73x = 12,910,182,285.93
  5. Step 5: Solve for x
    x = 12,910,182,285.93/128,990.73
  6. Step 6: Final answer
    x = 100,086.12

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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.