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Finding the Fourth Proportional to 664,654.60, 996,981.90 and 398,715.40

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Solution

The fourth proportional to 664,654.60, 996,981.90 and 398,715.40 is: 598,073.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,654.60 : 996,981.90 = 398,715.40 : x
  2. Step 2: Convert to fraction form
    664,654.60/996,981.90 = 398,715.40/x
  3. Step 3: Cross multiply
    664,654.60x = 996,981.90 × 398,715.40
  4. Step 4: Simplify right side
    664,654.60x = 397,512,037,051.26
  5. Step 5: Solve for x
    x = 397,512,037,051.26/664,654.60
  6. Step 6: Final answer
    x = 598,073.10

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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.