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Finding the Fourth Proportional to 386.48, 533.31 and 239.09

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Solution

The fourth proportional to 386.48, 533.31 and 239.09 is: 329.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.48 : 533.31 = 239.09 : x
  2. Step 2: Convert to fraction form
    386.48/533.31 = 239.09/x
  3. Step 3: Cross multiply
    386.48x = 533.31 × 239.09
  4. Step 4: Simplify right side
    386.48x = 127,506.42
  5. Step 5: Solve for x
    x = 127,506.42/386.48
  6. Step 6: Final answer
    x = 329.92

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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.