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Finding the Fourth Proportional to 258.20, 386.96 and 221.75

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Solution

The fourth proportional to 258.20, 386.96 and 221.75 is: 332.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.20 : 386.96 = 221.75 : x
  2. Step 2: Convert to fraction form
    258.20/386.96 = 221.75/x
  3. Step 3: Cross multiply
    258.20x = 386.96 × 221.75
  4. Step 4: Simplify right side
    258.20x = 85,805.34
  5. Step 5: Solve for x
    x = 85,805.34/258.20
  6. Step 6: Final answer
    x = 332.33

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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.