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Finding the Fourth Proportional to 258.91, 388.54 and 143.44

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Solution

The fourth proportional to 258.91, 388.54 and 143.44 is: 215.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.91 : 388.54 = 143.44 : x
  2. Step 2: Convert to fraction form
    258.91/388.54 = 143.44/x
  3. Step 3: Cross multiply
    258.91x = 388.54 × 143.44
  4. Step 4: Simplify right side
    258.91x = 55,732.18
  5. Step 5: Solve for x
    x = 55,732.18/258.91
  6. Step 6: Final answer
    x = 215.26

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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.