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Finding the Fourth Proportional to 354.48, 489.18 and 207.11

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Solution

The fourth proportional to 354.48, 489.18 and 207.11 is: 285.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.48 : 489.18 = 207.11 : x
  2. Step 2: Convert to fraction form
    354.48/489.18 = 207.11/x
  3. Step 3: Cross multiply
    354.48x = 489.18 × 207.11
  4. Step 4: Simplify right side
    354.48x = 101,311.62
  5. Step 5: Solve for x
    x = 101,311.62/354.48
  6. Step 6: Final answer
    x = 285.80

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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.