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Finding the Fourth Proportional to 815.08, 1,220.54 and 449.47

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Solution

The fourth proportional to 815.08, 1,220.54 and 449.47 is: 673.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.08 : 1,220.54 = 449.47 : x
  2. Step 2: Convert to fraction form
    815.08/1,220.54 = 449.47/x
  3. Step 3: Cross multiply
    815.08x = 1,220.54 × 449.47
  4. Step 4: Simplify right side
    815.08x = 548,596.11
  5. Step 5: Solve for x
    x = 548,596.11/815.08
  6. Step 6: Final answer
    x = 673.06

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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.