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Finding the Fourth Proportional to 394,426.70, 591,640.05 and 128,195.90

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Solution

The fourth proportional to 394,426.70, 591,640.05 and 128,195.90 is: 192,293.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,426.70 : 591,640.05 = 128,195.90 : x
  2. Step 2: Convert to fraction form
    394,426.70/591,640.05 = 128,195.90/x
  3. Step 3: Cross multiply
    394,426.70x = 591,640.05 × 128,195.90
  4. Step 4: Simplify right side
    394,426.70x = 75,845,828,685.80
  5. Step 5: Solve for x
    x = 75,845,828,685.80/394,426.70
  6. Step 6: Final answer
    x = 192,293.85

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1.5x scale

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.