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Finding the Fourth Proportional to 325.15, 487.73 and 81.68

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Solution

The fourth proportional to 325.15, 487.73 and 81.68 is: 122.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.15 : 487.73 = 81.68 : x
  2. Step 2: Convert to fraction form
    325.15/487.73 = 81.68/x
  3. Step 3: Cross multiply
    325.15x = 487.73 × 81.68
  4. Step 4: Simplify right side
    325.15x = 39,836.77
  5. Step 5: Solve for x
    x = 39,836.77/325.15
  6. Step 6: Final answer
    x = 122.52

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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.