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Finding the Fourth Proportional to 356.22, 491.74 and 239.85

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Solution

The fourth proportional to 356.22, 491.74 and 239.85 is: 331.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.22 : 491.74 = 239.85 : x
  2. Step 2: Convert to fraction form
    356.22/491.74 = 239.85/x
  3. Step 3: Cross multiply
    356.22x = 491.74 × 239.85
  4. Step 4: Simplify right side
    356.22x = 117,942.64
  5. Step 5: Solve for x
    x = 117,942.64/356.22
  6. Step 6: Final answer
    x = 331.09

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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.