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Finding the Fourth Proportional to 665,449.60, 996,862.20 and 398,416.90

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Solution

The fourth proportional to 665,449.60, 996,862.20 and 398,416.90 is: 596,839.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,449.60 : 996,862.20 = 398,416.90 : x
  2. Step 2: Convert to fraction form
    665,449.60/996,862.20 = 398,416.90/x
  3. Step 3: Cross multiply
    665,449.60x = 996,862.20 × 398,416.90
  4. Step 4: Simplify right side
    665,449.60x = 397,166,747,451.18
  5. Step 5: Solve for x
    x = 397,166,747,451.18/665,449.60
  6. Step 6: Final answer
    x = 596,839.71

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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.