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Finding the Fourth Proportional to 354.53, 489.17 and 207.11

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Solution

The fourth proportional to 354.53, 489.17 and 207.11 is: 285.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.53 : 489.17 = 207.11 : x
  2. Step 2: Convert to fraction form
    354.53/489.17 = 207.11/x
  3. Step 3: Cross multiply
    354.53x = 489.17 × 207.11
  4. Step 4: Simplify right side
    354.53x = 101,308.52
  5. Step 5: Solve for x
    x = 101,308.52/354.53
  6. Step 6: Final answer
    x = 285.76

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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.