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Finding the Fourth Proportional to 128,672.28, 192,999.12 and 39,923.52

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Solution

The fourth proportional to 128,672.28, 192,999.12 and 39,923.52 is: 59,882.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,672.28 : 192,999.12 = 39,923.52 : x
  2. Step 2: Convert to fraction form
    128,672.28/192,999.12 = 39,923.52/x
  3. Step 3: Cross multiply
    128,672.28x = 192,999.12 × 39,923.52
  4. Step 4: Simplify right side
    128,672.28x = 7,705,204,227.30
  5. Step 5: Solve for x
    x = 7,705,204,227.30/128,672.28
  6. Step 6: Final answer
    x = 59,882.39

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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.