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Finding the Fourth Proportional to 447.75, 617.91 and 261.20

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Solution

The fourth proportional to 447.75, 617.91 and 261.20 is: 360.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.75 : 617.91 = 261.20 : x
  2. Step 2: Convert to fraction form
    447.75/617.91 = 261.20/x
  3. Step 3: Cross multiply
    447.75x = 617.91 × 261.20
  4. Step 4: Simplify right side
    447.75x = 161,398.09
  5. Step 5: Solve for x
    x = 161,398.09/447.75
  6. Step 6: Final answer
    x = 360.46

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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.