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Finding the Fourth Proportional to 353.17, 487.15 and 221.95

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Solution

The fourth proportional to 353.17, 487.15 and 221.95 is: 306.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.17 : 487.15 = 221.95 : x
  2. Step 2: Convert to fraction form
    353.17/487.15 = 221.95/x
  3. Step 3: Cross multiply
    353.17x = 487.15 × 221.95
  4. Step 4: Simplify right side
    353.17x = 108,124.16
  5. Step 5: Solve for x
    x = 108,124.16/353.17
  6. Step 6: Final answer
    x = 306.15

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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.