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Finding the Fourth Proportional to 658.18, 987.31 and 171.24

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Solution

The fourth proportional to 658.18, 987.31 and 171.24 is: 256.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.18 : 987.31 = 171.24 : x
  2. Step 2: Convert to fraction form
    658.18/987.31 = 171.24/x
  3. Step 3: Cross multiply
    658.18x = 987.31 × 171.24
  4. Step 4: Simplify right side
    658.18x = 169,066.96
  5. Step 5: Solve for x
    x = 169,066.96/658.18
  6. Step 6: Final answer
    x = 256.87

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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.