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Finding the Fourth Proportional to 128,900.52, 193,266.90 and 54,068.64

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Solution

The fourth proportional to 128,900.52, 193,266.90 and 54,068.64 is: 81,067.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,900.52 : 193,266.90 = 54,068.64 : x
  2. Step 2: Convert to fraction form
    128,900.52/193,266.90 = 54,068.64/x
  3. Step 3: Cross multiply
    128,900.52x = 193,266.90 × 54,068.64
  4. Step 4: Simplify right side
    128,900.52x = 10,449,678,440.02
  5. Step 5: Solve for x
    x = 10,449,678,440.02/128,900.52
  6. Step 6: Final answer
    x = 81,067.78

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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.