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Finding the Fourth Proportional to 325.97, 489.09 and 285.47

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Solution

The fourth proportional to 325.97, 489.09 and 285.47 is: 428.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.97 : 489.09 = 285.47 : x
  2. Step 2: Convert to fraction form
    325.97/489.09 = 285.47/x
  3. Step 3: Cross multiply
    325.97x = 489.09 × 285.47
  4. Step 4: Simplify right side
    325.97x = 139,620.52
  5. Step 5: Solve for x
    x = 139,620.52/325.97
  6. Step 6: Final answer
    x = 428.32

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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.