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Finding the Fourth Proportional to 394,486.70, 591,730.05 and 128,255.90

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Solution

The fourth proportional to 394,486.70, 591,730.05 and 128,255.90 is: 192,383.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,486.70 : 591,730.05 = 128,255.90 : x
  2. Step 2: Convert to fraction form
    394,486.70/591,730.05 = 128,255.90/x
  3. Step 3: Cross multiply
    394,486.70x = 591,730.05 × 128,255.90
  4. Step 4: Simplify right side
    394,486.70x = 75,892,870,119.80
  5. Step 5: Solve for x
    x = 75,892,870,119.80/394,486.70
  6. Step 6: Final answer
    x = 192,383.85

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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.