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Finding the Fourth Proportional to 664,447.20, 996,670.80 and 398,070.60

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Solution

The fourth proportional to 664,447.20, 996,670.80 and 398,070.60 is: 597,105.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,447.20 : 996,670.80 = 398,070.60 : x
  2. Step 2: Convert to fraction form
    664,447.20/996,670.80 = 398,070.60/x
  3. Step 3: Cross multiply
    664,447.20x = 996,670.80 × 398,070.60
  4. Step 4: Simplify right side
    664,447.20x = 396,745,343,358.48
  5. Step 5: Solve for x
    x = 396,745,343,358.48/664,447.20
  6. Step 6: Final answer
    x = 597,105.90

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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.