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Finding the Fourth Proportional to 814.05, 1,217.99 and 449.09

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Solution

The fourth proportional to 814.05, 1,217.99 and 449.09 is: 671.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.05 : 1,217.99 = 449.09 : x
  2. Step 2: Convert to fraction form
    814.05/1,217.99 = 449.09/x
  3. Step 3: Cross multiply
    814.05x = 1,217.99 × 449.09
  4. Step 4: Simplify right side
    814.05x = 546,991.05
  5. Step 5: Solve for x
    x = 546,991.05/814.05
  6. Step 6: Final answer
    x = 671.94

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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.