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Finding the Fourth Proportional to 442.82, 664.29 and 261.38

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Solution

The fourth proportional to 442.82, 664.29 and 261.38 is: 392.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.82 : 664.29 = 261.38 : x
  2. Step 2: Convert to fraction form
    442.82/664.29 = 261.38/x
  3. Step 3: Cross multiply
    442.82x = 664.29 × 261.38
  4. Step 4: Simplify right side
    442.82x = 173,628.80
  5. Step 5: Solve for x
    x = 173,628.80/442.82
  6. Step 6: Final answer
    x = 392.10

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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.