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Finding the Fourth Proportional to 257.92, 386.09 and 166.68

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Solution

The fourth proportional to 257.92, 386.09 and 166.68 is: 249.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.92 : 386.09 = 166.68 : x
  2. Step 2: Convert to fraction form
    257.92/386.09 = 166.68/x
  3. Step 3: Cross multiply
    257.92x = 386.09 × 166.68
  4. Step 4: Simplify right side
    257.92x = 64,351.55
  5. Step 5: Solve for x
    x = 64,351.55/257.92
  6. Step 6: Final answer
    x = 249.51

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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.