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Finding the Fourth Proportional to 171.38, 257.12 and 68.71

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Solution

The fourth proportional to 171.38, 257.12 and 68.71 is: 103.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.38 : 257.12 = 68.71 : x
  2. Step 2: Convert to fraction form
    171.38/257.12 = 68.71/x
  3. Step 3: Cross multiply
    171.38x = 257.12 × 68.71
  4. Step 4: Simplify right side
    171.38x = 17,666.72
  5. Step 5: Solve for x
    x = 17,666.72/171.38
  6. Step 6: Final answer
    x = 103.09

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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.