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Finding the Fourth Proportional to 665,431.60, 996,835.20 and 398,398.90

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Solution

The fourth proportional to 665,431.60, 996,835.20 and 398,398.90 is: 596,812.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,431.60 : 996,835.20 = 398,398.90 : x
  2. Step 2: Convert to fraction form
    665,431.60/996,835.20 = 398,398.90/x
  3. Step 3: Cross multiply
    665,431.60x = 996,835.20 × 398,398.90
  4. Step 4: Simplify right side
    665,431.60x = 397,138,047,161.28
  5. Step 5: Solve for x
    x = 397,138,047,161.28/665,431.60
  6. Step 6: Final answer
    x = 596,812.73

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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.