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Finding the Fourth Proportional to 386.69, 533.88 and 239.54

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Solution

The fourth proportional to 386.69, 533.88 and 239.54 is: 330.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.69 : 533.88 = 239.54 : x
  2. Step 2: Convert to fraction form
    386.69/533.88 = 239.54/x
  3. Step 3: Cross multiply
    386.69x = 533.88 × 239.54
  4. Step 4: Simplify right side
    386.69x = 127,882.95
  5. Step 5: Solve for x
    x = 127,882.95/386.69
  6. Step 6: Final answer
    x = 330.72

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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.