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Finding the Fourth Proportional to 349.52, 524.28 and 221

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Solution

The fourth proportional to 349.52, 524.28 and 221 is: 331.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.52 : 524.28 = 221 : x
  2. Step 2: Convert to fraction form
    349.52/524.28 = 221/x
  3. Step 3: Cross multiply
    349.52x = 524.28 × 221
  4. Step 4: Simplify right side
    349.52x = 115,865.88
  5. Step 5: Solve for x
    x = 115,865.88/349.52
  6. Step 6: Final answer
    x = 331.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.