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Finding the Fourth Proportional to 665,755.20, 998,049.60 and 399,232.80

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Solution

The fourth proportional to 665,755.20, 998,049.60 and 399,232.80 is: 598,499.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,755.20 : 998,049.60 = 399,232.80 : x
  2. Step 2: Convert to fraction form
    665,755.20/998,049.60 = 399,232.80/x
  3. Step 3: Cross multiply
    665,755.20x = 998,049.60 × 399,232.80
  4. Step 4: Simplify right side
    665,755.20x = 398,454,136,346.88
  5. Step 5: Solve for x
    x = 398,454,136,346.88/665,755.20
  6. Step 6: Final answer
    x = 598,499.47

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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.