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Finding the Fourth Proportional to 355.97, 491.38 and 239.60

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Solution

The fourth proportional to 355.97, 491.38 and 239.60 is: 330.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.97 : 491.38 = 239.60 : x
  2. Step 2: Convert to fraction form
    355.97/491.38 = 239.60/x
  3. Step 3: Cross multiply
    355.97x = 491.38 × 239.60
  4. Step 4: Simplify right side
    355.97x = 117,732.49
  5. Step 5: Solve for x
    x = 117,732.49/355.97
  6. Step 6: Final answer
    x = 330.74

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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.