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Finding the Fourth Proportional to 325.35, 488.03 and 81.87

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Solution

The fourth proportional to 325.35, 488.03 and 81.87 is: 122.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.35 : 488.03 = 81.87 : x
  2. Step 2: Convert to fraction form
    325.35/488.03 = 81.87/x
  3. Step 3: Cross multiply
    325.35x = 488.03 × 81.87
  4. Step 4: Simplify right side
    325.35x = 39,956.21
  5. Step 5: Solve for x
    x = 39,956.21/325.35
  6. Step 6: Final answer
    x = 122.81

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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.