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Finding the Fourth Proportional to 481.72, 664.72 and 355.75

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Solution

The fourth proportional to 481.72, 664.72 and 355.75 is: 490.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.72 : 664.72 = 355.75 : x
  2. Step 2: Convert to fraction form
    481.72/664.72 = 355.75/x
  3. Step 3: Cross multiply
    481.72x = 664.72 × 355.75
  4. Step 4: Simplify right side
    481.72x = 236,472.48
  5. Step 5: Solve for x
    x = 236,472.48/481.72
  6. Step 6: Final answer
    x = 490.89

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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.