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Finding the Fourth Proportional to 604.20, 904.38 and 489

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Solution

The fourth proportional to 604.20, 904.38 and 489 is: 731.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    604.20 : 904.38 = 489 : x
  2. Step 2: Convert to fraction form
    604.20/904.38 = 489/x
  3. Step 3: Cross multiply
    604.20x = 904.38 × 489
  4. Step 4: Simplify right side
    604.20x = 442,241.82
  5. Step 5: Solve for x
    x = 442,241.82/604.20
  6. Step 6: Final answer
    x = 731.95

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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.