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Finding the Fourth Proportional to 128,911.92, 193,377.08 and 53,956.60

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Solution

The fourth proportional to 128,911.92, 193,377.08 and 53,956.60 is: 80,938.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,911.92 : 193,377.08 = 53,956.60 : x
  2. Step 2: Convert to fraction form
    128,911.92/193,377.08 = 53,956.60/x
  3. Step 3: Cross multiply
    128,911.92x = 193,377.08 × 53,956.60
  4. Step 4: Simplify right side
    128,911.92x = 10,433,969,754.73
  5. Step 5: Solve for x
    x = 10,433,969,754.73/128,911.92
  6. Step 6: Final answer
    x = 80,938.75

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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.