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Finding the Fourth Proportional to 665,753.40, 998,046.90 and 399,619.80

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Solution

The fourth proportional to 665,753.40, 998,046.90 and 399,619.80 is: 599,079.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,753.40 : 998,046.90 = 399,619.80 : x
  2. Step 2: Convert to fraction form
    665,753.40/998,046.90 = 399,619.80/x
  3. Step 3: Cross multiply
    665,753.40x = 998,046.90 × 399,619.80
  4. Step 4: Simplify right side
    665,753.40x = 398,839,302,568.62
  5. Step 5: Solve for x
    x = 398,839,302,568.62/665,753.40
  6. Step 6: Final answer
    x = 599,079.63

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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.