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Finding the Fourth Proportional to 386.81, 533.53 and 239.18

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Solution

The fourth proportional to 386.81, 533.53 and 239.18 is: 329.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.81 : 533.53 = 239.18 : x
  2. Step 2: Convert to fraction form
    386.81/533.53 = 239.18/x
  3. Step 3: Cross multiply
    386.81x = 533.53 × 239.18
  4. Step 4: Simplify right side
    386.81x = 127,610.44
  5. Step 5: Solve for x
    x = 127,610.44/386.81
  6. Step 6: Final answer
    x = 329.91

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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.