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Finding the Fourth Proportional to 1,327.06, 1,990.91 and 449.55

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Solution

The fourth proportional to 1,327.06, 1,990.91 and 449.55 is: 674.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.06 : 1,990.91 = 449.55 : x
  2. Step 2: Convert to fraction form
    1,327.06/1,990.91 = 449.55/x
  3. Step 3: Cross multiply
    1,327.06x = 1,990.91 × 449.55
  4. Step 4: Simplify right side
    1,327.06x = 895,001.39
  5. Step 5: Solve for x
    x = 895,001.39/1,327.06
  6. Step 6: Final answer
    x = 674.42

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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.