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Finding the Fourth Proportional to 308.52, 425.54 and 221

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Solution

The fourth proportional to 308.52, 425.54 and 221 is: 304.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.52 : 425.54 = 221 : x
  2. Step 2: Convert to fraction form
    308.52/425.54 = 221/x
  3. Step 3: Cross multiply
    308.52x = 425.54 × 221
  4. Step 4: Simplify right side
    308.52x = 94,044.34
  5. Step 5: Solve for x
    x = 94,044.34/308.52
  6. Step 6: Final answer
    x = 304.82

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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.