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Finding the Fourth Proportional to 665,627.70, 998,441.55 and 399,251.10

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Solution

The fourth proportional to 665,627.70, 998,441.55 and 399,251.10 is: 598,876.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,627.70 : 998,441.55 = 399,251.10 : x
  2. Step 2: Convert to fraction form
    665,627.70/998,441.55 = 399,251.10/x
  3. Step 3: Cross multiply
    665,627.70x = 998,441.55 × 399,251.10
  4. Step 4: Simplify right side
    665,627.70x = 398,628,887,123.21
  5. Step 5: Solve for x
    x = 398,628,887,123.21/665,627.70
  6. Step 6: Final answer
    x = 598,876.65

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Half scale
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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.