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Finding the Fourth Proportional to 171.68, 257.55 and 74.25

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Solution

The fourth proportional to 171.68, 257.55 and 74.25 is: 111.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.68 : 257.55 = 74.25 : x
  2. Step 2: Convert to fraction form
    171.68/257.55 = 74.25/x
  3. Step 3: Cross multiply
    171.68x = 257.55 × 74.25
  4. Step 4: Simplify right side
    171.68x = 19,123.73
  5. Step 5: Solve for x
    x = 19,123.73/171.68
  6. Step 6: Final answer
    x = 111.39

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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.