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Finding the Fourth Proportional to 171.61, 257.31 and 84.97

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Solution

The fourth proportional to 171.61, 257.31 and 84.97 is: 127.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.61 : 257.31 = 84.97 : x
  2. Step 2: Convert to fraction form
    171.61/257.31 = 84.97/x
  3. Step 3: Cross multiply
    171.61x = 257.31 × 84.97
  4. Step 4: Simplify right side
    171.61x = 21,863.63
  5. Step 5: Solve for x
    x = 21,863.63/171.61
  6. Step 6: Final answer
    x = 127.40

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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.