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Finding the Fourth Proportional to 619,806.40, 929,709.60 and 419,039.80

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Solution

The fourth proportional to 619,806.40, 929,709.60 and 419,039.80 is: 628,559.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,806.40 : 929,709.60 = 419,039.80 : x
  2. Step 2: Convert to fraction form
    619,806.40/929,709.60 = 419,039.80/x
  3. Step 3: Cross multiply
    619,806.40x = 929,709.60 × 419,039.80
  4. Step 4: Simplify right side
    619,806.40x = 389,585,324,842.08
  5. Step 5: Solve for x
    x = 389,585,324,842.08/619,806.40
  6. Step 6: Final answer
    x = 628,559.70

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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.