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Finding the Fourth Proportional to 394,426.80, 591,640.20 and 217,279.80

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Solution

The fourth proportional to 394,426.80, 591,640.20 and 217,279.80 is: 325,919.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,426.80 : 591,640.20 = 217,279.80 : x
  2. Step 2: Convert to fraction form
    394,426.80/591,640.20 = 217,279.80/x
  3. Step 3: Cross multiply
    394,426.80x = 591,640.20 × 217,279.80
  4. Step 4: Simplify right side
    394,426.80x = 128,551,464,327.96
  5. Step 5: Solve for x
    x = 128,551,464,327.96/394,426.80
  6. Step 6: Final answer
    x = 325,919.70

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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.