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Finding the Fourth Proportional to 171.67, 257.31 and 68.86

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Solution

The fourth proportional to 171.67, 257.31 and 68.86 is: 103.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.67 : 257.31 = 68.86 : x
  2. Step 2: Convert to fraction form
    171.67/257.31 = 68.86/x
  3. Step 3: Cross multiply
    171.67x = 257.31 × 68.86
  4. Step 4: Simplify right side
    171.67x = 17,718.37
  5. Step 5: Solve for x
    x = 17,718.37/171.67
  6. Step 6: Final answer
    x = 103.21

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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.