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Finding the Fourth Proportional to 354.39, 531.31 and 161.88

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Solution

The fourth proportional to 354.39, 531.31 and 161.88 is: 242.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.39 : 531.31 = 161.88 : x
  2. Step 2: Convert to fraction form
    354.39/531.31 = 161.88/x
  3. Step 3: Cross multiply
    354.39x = 531.31 × 161.88
  4. Step 4: Simplify right side
    354.39x = 86,008.46
  5. Step 5: Solve for x
    x = 86,008.46/354.39
  6. Step 6: Final answer
    x = 242.69

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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.