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Finding the Fourth Proportional to 258.44, 386.82 and 219.65

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Solution

The fourth proportional to 258.44, 386.82 and 219.65 is: 328.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.44 : 386.82 = 219.65 : x
  2. Step 2: Convert to fraction form
    258.44/386.82 = 219.65/x
  3. Step 3: Cross multiply
    258.44x = 386.82 × 219.65
  4. Step 4: Simplify right side
    258.44x = 84,963.08
  5. Step 5: Solve for x
    x = 84,963.08/258.44
  6. Step 6: Final answer
    x = 328.76

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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.