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Finding the Fourth Proportional to 447.05, 616.74 and 281.15

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Solution

The fourth proportional to 447.05, 616.74 and 281.15 is: 387.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.05 : 616.74 = 281.15 : x
  2. Step 2: Convert to fraction form
    447.05/616.74 = 281.15/x
  3. Step 3: Cross multiply
    447.05x = 616.74 × 281.15
  4. Step 4: Simplify right side
    447.05x = 173,396.45
  5. Step 5: Solve for x
    x = 173,396.45/447.05
  6. Step 6: Final answer
    x = 387.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.