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Finding the Fourth Proportional to 814.99, 1,220.40 and 449.37

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Solution

The fourth proportional to 814.99, 1,220.40 and 449.37 is: 672.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.99 : 1,220.40 = 449.37 : x
  2. Step 2: Convert to fraction form
    814.99/1,220.40 = 449.37/x
  3. Step 3: Cross multiply
    814.99x = 1,220.40 × 449.37
  4. Step 4: Simplify right side
    814.99x = 548,415.72
  5. Step 5: Solve for x
    x = 548,415.72/814.99
  6. Step 6: Final answer
    x = 672.91

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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.