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Finding the Fourth Proportional to 258.27, 388.32 and 238.20

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Solution

The fourth proportional to 258.27, 388.32 and 238.20 is: 358.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.27 : 388.32 = 238.20 : x
  2. Step 2: Convert to fraction form
    258.27/388.32 = 238.20/x
  3. Step 3: Cross multiply
    258.27x = 388.32 × 238.20
  4. Step 4: Simplify right side
    258.27x = 92,497.82
  5. Step 5: Solve for x
    x = 92,497.82/258.27
  6. Step 6: Final answer
    x = 358.14

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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.