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Finding the Fourth Proportional to 325.81, 489.12 and 217.27

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Solution

The fourth proportional to 325.81, 489.12 and 217.27 is: 326.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.81 : 489.12 = 217.27 : x
  2. Step 2: Convert to fraction form
    325.81/489.12 = 217.27/x
  3. Step 3: Cross multiply
    325.81x = 489.12 × 217.27
  4. Step 4: Simplify right side
    325.81x = 106,271.10
  5. Step 5: Solve for x
    x = 106,271.10/325.81
  6. Step 6: Final answer
    x = 326.18

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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.