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Finding the Fourth Proportional to 171.76, 257.82 and 85.16

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Solution

The fourth proportional to 171.76, 257.82 and 85.16 is: 127.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.76 : 257.82 = 85.16 : x
  2. Step 2: Convert to fraction form
    171.76/257.82 = 85.16/x
  3. Step 3: Cross multiply
    171.76x = 257.82 × 85.16
  4. Step 4: Simplify right side
    171.76x = 21,955.95
  5. Step 5: Solve for x
    x = 21,955.95/171.76
  6. Step 6: Final answer
    x = 127.83

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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.