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Finding the Fourth Proportional to 388,129.61, 582,010.07 and 135,379.41

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Solution

The fourth proportional to 388,129.61, 582,010.07 and 135,379.41 is: 203,004.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,129.61 : 582,010.07 = 135,379.41 : x
  2. Step 2: Convert to fraction form
    388,129.61/582,010.07 = 135,379.41/x
  3. Step 3: Cross multiply
    388,129.61x = 582,010.07 × 135,379.41
  4. Step 4: Simplify right side
    388,129.61x = 78,792,179,213.76
  5. Step 5: Solve for x
    x = 78,792,179,213.76/388,129.61
  6. Step 6: Final answer
    x = 203,004.82

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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.