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Finding the Fourth Proportional to 258.41, 386.78 and 165.92

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Solution

The fourth proportional to 258.41, 386.78 and 165.92 is: 248.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.41 : 386.78 = 165.92 : x
  2. Step 2: Convert to fraction form
    258.41/386.78 = 165.92/x
  3. Step 3: Cross multiply
    258.41x = 386.78 × 165.92
  4. Step 4: Simplify right side
    258.41x = 64,171.77
  5. Step 5: Solve for x
    x = 64,171.77/258.41
  6. Step 6: Final answer
    x = 248.34

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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.