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Finding the Fourth Proportional to 543,919.40, 815,879.10 and 419,503.40

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Solution

The fourth proportional to 543,919.40, 815,879.10 and 419,503.40 is: 629,255.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,919.40 : 815,879.10 = 419,503.40 : x
  2. Step 2: Convert to fraction form
    543,919.40/815,879.10 = 419,503.40/x
  3. Step 3: Cross multiply
    543,919.40x = 815,879.10 × 419,503.40
  4. Step 4: Simplify right side
    543,919.40x = 342,264,056,438.94
  5. Step 5: Solve for x
    x = 342,264,056,438.94/543,919.40
  6. Step 6: Final answer
    x = 629,255.10

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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.