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Finding the Fourth Proportional to 664,428.80, 996,643.20 and 398,052.20

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Solution

The fourth proportional to 664,428.80, 996,643.20 and 398,052.20 is: 597,078.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,428.80 : 996,643.20 = 398,052.20 : x
  2. Step 2: Convert to fraction form
    664,428.80/996,643.20 = 398,052.20/x
  3. Step 3: Cross multiply
    664,428.80x = 996,643.20 × 398,052.20
  4. Step 4: Simplify right side
    664,428.80x = 396,716,018,375.04
  5. Step 5: Solve for x
    x = 396,716,018,375.04/664,428.80
  6. Step 6: Final answer
    x = 597,078.30

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Similar ratio
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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.