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Finding the Fourth Proportional to 638,854.20, 958,281.30 and 189,644.40

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Solution

The fourth proportional to 638,854.20, 958,281.30 and 189,644.40 is: 284,466.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,854.20 : 958,281.30 = 189,644.40 : x
  2. Step 2: Convert to fraction form
    638,854.20/958,281.30 = 189,644.40/x
  3. Step 3: Cross multiply
    638,854.20x = 958,281.30 × 189,644.40
  4. Step 4: Simplify right side
    638,854.20x = 181,732,682,169.72
  5. Step 5: Solve for x
    x = 181,732,682,169.72/638,854.20
  6. Step 6: Final answer
    x = 284,466.60

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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.