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Finding the Fourth Proportional to 489, 734.28 and 408.48

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Solution

The fourth proportional to 489, 734.28 and 408.48 is: 613.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 734.28 = 408.48 : x
  2. Step 2: Convert to fraction form
    489/734.28 = 408.48/x
  3. Step 3: Cross multiply
    489x = 734.28 × 408.48
  4. Step 4: Simplify right side
    489x = 299,938.69
  5. Step 5: Solve for x
    x = 299,938.69/489
  6. Step 6: Final answer
    x = 613.37

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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.