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Finding the Fourth Proportional to 166.54, 249.66 and 85.31

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Solution

The fourth proportional to 166.54, 249.66 and 85.31 is: 127.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.54 : 249.66 = 85.31 : x
  2. Step 2: Convert to fraction form
    166.54/249.66 = 85.31/x
  3. Step 3: Cross multiply
    166.54x = 249.66 × 85.31
  4. Step 4: Simplify right side
    166.54x = 21,298.49
  5. Step 5: Solve for x
    x = 21,298.49/166.54
  6. Step 6: Final answer
    x = 127.89

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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.