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Finding the Fourth Proportional to 354.20, 531.32 and 171.09

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Solution

The fourth proportional to 354.20, 531.32 and 171.09 is: 256.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.20 : 531.32 = 171.09 : x
  2. Step 2: Convert to fraction form
    354.20/531.32 = 171.09/x
  3. Step 3: Cross multiply
    354.20x = 531.32 × 171.09
  4. Step 4: Simplify right side
    354.20x = 90,902.68
  5. Step 5: Solve for x
    x = 90,902.68/354.20
  6. Step 6: Final answer
    x = 256.65

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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.