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Finding the Fourth Proportional to 128,980.62, 193,480.47 and 54,025.38

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Solution

The fourth proportional to 128,980.62, 193,480.47 and 54,025.38 is: 81,042.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,980.62 : 193,480.47 = 54,025.38 : x
  2. Step 2: Convert to fraction form
    128,980.62/193,480.47 = 54,025.38/x
  3. Step 3: Cross multiply
    128,980.62x = 193,480.47 × 54,025.38
  4. Step 4: Simplify right side
    128,980.62x = 10,452,855,914.33
  5. Step 5: Solve for x
    x = 10,452,855,914.33/128,980.62
  6. Step 6: Final answer
    x = 81,042.07

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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.