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Finding the Fourth Proportional to 543,879.40, 815,819.10 and 419,463.40

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Solution

The fourth proportional to 543,879.40, 815,819.10 and 419,463.40 is: 629,195.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,879.40 : 815,819.10 = 419,463.40 : x
  2. Step 2: Convert to fraction form
    543,879.40/815,819.10 = 419,463.40/x
  3. Step 3: Cross multiply
    543,879.40x = 815,819.10 × 419,463.40
  4. Step 4: Simplify right side
    543,879.40x = 342,206,253,470.94
  5. Step 5: Solve for x
    x = 342,206,253,470.94/543,879.40
  6. Step 6: Final answer
    x = 629,195.10

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Double scale
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Similar ratio
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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.