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Finding the Fourth Proportional to 447.54, 617.49 and 398.58

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Solution

The fourth proportional to 447.54, 617.49 and 398.58 is: 549.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.54 : 617.49 = 398.58 : x
  2. Step 2: Convert to fraction form
    447.54/617.49 = 398.58/x
  3. Step 3: Cross multiply
    447.54x = 617.49 × 398.58
  4. Step 4: Simplify right side
    447.54x = 246,119.16
  5. Step 5: Solve for x
    x = 246,119.16/447.54
  6. Step 6: Final answer
    x = 549.94

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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.