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Finding the Fourth Proportional to 619,246.40, 928,869.60 and 381,819.20

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Solution

The fourth proportional to 619,246.40, 928,869.60 and 381,819.20 is: 572,728.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,246.40 : 928,869.60 = 381,819.20 : x
  2. Step 2: Convert to fraction form
    619,246.40/928,869.60 = 381,819.20/x
  3. Step 3: Cross multiply
    619,246.40x = 928,869.60 × 381,819.20
  4. Step 4: Simplify right side
    619,246.40x = 354,660,247,576.32
  5. Step 5: Solve for x
    x = 354,660,247,576.32/619,246.40
  6. Step 6: Final answer
    x = 572,728.80

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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.