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Finding the Fourth Proportional to 128,285.46, 192,270.36 and 72,007.47

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Solution

The fourth proportional to 128,285.46, 192,270.36 and 72,007.47 is: 107,922.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,285.46 : 192,270.36 = 72,007.47 : x
  2. Step 2: Convert to fraction form
    128,285.46/192,270.36 = 72,007.47/x
  3. Step 3: Cross multiply
    128,285.46x = 192,270.36 × 72,007.47
  4. Step 4: Simplify right side
    128,285.46x = 13,844,902,179.59
  5. Step 5: Solve for x
    x = 13,844,902,179.59/128,285.46
  6. Step 6: Final answer
    x = 107,922.61

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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.