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Finding the Fourth Proportional to 386.17, 533.28 and 238.85

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Solution

The fourth proportional to 386.17, 533.28 and 238.85 is: 329.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.17 : 533.28 = 238.85 : x
  2. Step 2: Convert to fraction form
    386.17/533.28 = 238.85/x
  3. Step 3: Cross multiply
    386.17x = 533.28 × 238.85
  4. Step 4: Simplify right side
    386.17x = 127,374.16
  5. Step 5: Solve for x
    x = 127,374.16/386.17
  6. Step 6: Final answer
    x = 329.84

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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.