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Finding the Fourth Proportional to 394,978.74, 592,529.55 and 128,677.26

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Solution

The fourth proportional to 394,978.74, 592,529.55 and 128,677.26 is: 193,035.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,978.74 : 592,529.55 = 128,677.26 : x
  2. Step 2: Convert to fraction form
    394,978.74/592,529.55 = 128,677.26/x
  3. Step 3: Cross multiply
    394,978.74x = 592,529.55 × 128,677.26
  4. Step 4: Simplify right side
    394,978.74x = 76,245,078,963.03
  5. Step 5: Solve for x
    x = 76,245,078,963.03/394,978.74
  6. Step 6: Final answer
    x = 193,035.91

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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.