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Finding the Fourth Proportional to 664,658.60, 996,987.90 and 398,719.40

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Solution

The fourth proportional to 664,658.60, 996,987.90 and 398,719.40 is: 598,079.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,658.60 : 996,987.90 = 398,719.40 : x
  2. Step 2: Convert to fraction form
    664,658.60/996,987.90 = 398,719.40/x
  3. Step 3: Cross multiply
    664,658.60x = 996,987.90 × 398,719.40
  4. Step 4: Simplify right side
    664,658.60x = 397,518,417,295.26
  5. Step 5: Solve for x
    x = 397,518,417,295.26/664,658.60
  6. Step 6: Final answer
    x = 598,079.10

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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.