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Finding the Fourth Proportional to 613.62, 920.67 and 449.22

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Solution

The fourth proportional to 613.62, 920.67 and 449.22 is: 674.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.62 : 920.67 = 449.22 : x
  2. Step 2: Convert to fraction form
    613.62/920.67 = 449.22/x
  3. Step 3: Cross multiply
    613.62x = 920.67 × 449.22
  4. Step 4: Simplify right side
    613.62x = 413,583.38
  5. Step 5: Solve for x
    x = 413,583.38/613.62
  6. Step 6: Final answer
    x = 674.01

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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.