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Finding the Fourth Proportional to 325.08, 487.62 and 81.61

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Solution

The fourth proportional to 325.08, 487.62 and 81.61 is: 122.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.08 : 487.62 = 81.61 : x
  2. Step 2: Convert to fraction form
    325.08/487.62 = 81.61/x
  3. Step 3: Cross multiply
    325.08x = 487.62 × 81.61
  4. Step 4: Simplify right side
    325.08x = 39,793.76
  5. Step 5: Solve for x
    x = 39,793.76/325.08
  6. Step 6: Final answer
    x = 122.41

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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.