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Finding the Fourth Proportional to 128,979.86, 193,544.51 and 54,093.33

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Solution

The fourth proportional to 128,979.86, 193,544.51 and 54,093.33 is: 81,171.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.86 : 193,544.51 = 54,093.33 : x
  2. Step 2: Convert to fraction form
    128,979.86/193,544.51 = 54,093.33/x
  3. Step 3: Cross multiply
    128,979.86x = 193,544.51 × 54,093.33
  4. Step 4: Simplify right side
    128,979.86x = 10,469,466,778.65
  5. Step 5: Solve for x
    x = 10,469,466,778.65/128,979.86
  6. Step 6: Final answer
    x = 81,171.33

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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.