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Finding the Fourth Proportional to 619,193.40, 928,790.10 and 430,236.60

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Solution

The fourth proportional to 619,193.40, 928,790.10 and 430,236.60 is: 645,354.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,193.40 : 928,790.10 = 430,236.60 : x
  2. Step 2: Convert to fraction form
    619,193.40/928,790.10 = 430,236.60/x
  3. Step 3: Cross multiply
    619,193.40x = 928,790.10 × 430,236.60
  4. Step 4: Simplify right side
    619,193.40x = 399,599,494,737.66
  5. Step 5: Solve for x
    x = 399,599,494,737.66/619,193.40
  6. Step 6: Final answer
    x = 645,354.90

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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.