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Finding the Fourth Proportional to 171.62, 257.31 and 74.18

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Solution

The fourth proportional to 171.62, 257.31 and 74.18 is: 111.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.62 : 257.31 = 74.18 : x
  2. Step 2: Convert to fraction form
    171.62/257.31 = 74.18/x
  3. Step 3: Cross multiply
    171.62x = 257.31 × 74.18
  4. Step 4: Simplify right side
    171.62x = 19,085.97
  5. Step 5: Solve for x
    x = 19,085.97/171.62
  6. Step 6: Final answer
    x = 111.21

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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.