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Finding the Fourth Proportional to 664,442.80, 996,664.20 and 398,066.20

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Solution

The fourth proportional to 664,442.80, 996,664.20 and 398,066.20 is: 597,099.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,442.80 : 996,664.20 = 398,066.20 : x
  2. Step 2: Convert to fraction form
    664,442.80/996,664.20 = 398,066.20/x
  3. Step 3: Cross multiply
    664,442.80x = 996,664.20 × 398,066.20
  4. Step 4: Simplify right side
    664,442.80x = 396,738,330,770.04
  5. Step 5: Solve for x
    x = 396,738,330,770.04/664,442.80
  6. Step 6: Final answer
    x = 597,099.30

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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.