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Finding the Fourth Proportional to 239.52, 356.91 and 221.16

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Solution

The fourth proportional to 239.52, 356.91 and 221.16 is: 329.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.52 : 356.91 = 221.16 : x
  2. Step 2: Convert to fraction form
    239.52/356.91 = 221.16/x
  3. Step 3: Cross multiply
    239.52x = 356.91 × 221.16
  4. Step 4: Simplify right side
    239.52x = 78,934.22
  5. Step 5: Solve for x
    x = 78,934.22/239.52
  6. Step 6: Final answer
    x = 329.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.