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Finding the Fourth Proportional to 665,754.20, 998,048.10 and 399,231.80

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Solution

The fourth proportional to 665,754.20, 998,048.10 and 399,231.80 is: 598,497.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,754.20 : 998,048.10 = 399,231.80 : x
  2. Step 2: Convert to fraction form
    665,754.20/998,048.10 = 399,231.80/x
  3. Step 3: Cross multiply
    665,754.20x = 998,048.10 × 399,231.80
  4. Step 4: Simplify right side
    665,754.20x = 398,452,539,449.58
  5. Step 5: Solve for x
    x = 398,452,539,449.58/665,754.20
  6. Step 6: Final answer
    x = 598,497.97

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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.