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Finding the Fourth Proportional to 815.54, 1,221.21 and 449.42

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Solution

The fourth proportional to 815.54, 1,221.21 and 449.42 is: 672.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.54 : 1,221.21 = 449.42 : x
  2. Step 2: Convert to fraction form
    815.54/1,221.21 = 449.42/x
  3. Step 3: Cross multiply
    815.54x = 1,221.21 × 449.42
  4. Step 4: Simplify right side
    815.54x = 548,830.09
  5. Step 5: Solve for x
    x = 548,830.09/815.54
  6. Step 6: Final answer
    x = 672.97

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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.