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Finding the Fourth Proportional to 258.25, 355.60 and 221.34

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Solution

The fourth proportional to 258.25, 355.60 and 221.34 is: 304.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.25 : 355.60 = 221.34 : x
  2. Step 2: Convert to fraction form
    258.25/355.60 = 221.34/x
  3. Step 3: Cross multiply
    258.25x = 355.60 × 221.34
  4. Step 4: Simplify right side
    258.25x = 78,708.50
  5. Step 5: Solve for x
    x = 78,708.50/258.25
  6. Step 6: Final answer
    x = 304.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.