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Finding the Fourth Proportional to 327, 451.28 and 189

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Solution

The fourth proportional to 327, 451.28 and 189 is: 260.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    327 : 451.28 = 189 : x
  2. Step 2: Convert to fraction form
    327/451.28 = 189/x
  3. Step 3: Cross multiply
    327x = 451.28 × 189
  4. Step 4: Simplify right side
    327x = 85,291.92
  5. Step 5: Solve for x
    x = 85,291.92/327
  6. Step 6: Final answer
    x = 260.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.