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Finding the Fourth Proportional to 638,999.70, 958,499.55 and 189,789.90

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Solution

The fourth proportional to 638,999.70, 958,499.55 and 189,789.90 is: 284,684.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,999.70 : 958,499.55 = 189,789.90 : x
  2. Step 2: Convert to fraction form
    638,999.70/958,499.55 = 189,789.90/x
  3. Step 3: Cross multiply
    638,999.70x = 958,499.55 × 189,789.90
  4. Step 4: Simplify right side
    638,999.70x = 181,913,533,744.55
  5. Step 5: Solve for x
    x = 181,913,533,744.55/638,999.70
  6. Step 6: Final answer
    x = 284,684.85

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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.