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Finding the Fourth Proportional to 386.44, 533.40 and 239.20

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Solution

The fourth proportional to 386.44, 533.40 and 239.20 is: 330.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.44 : 533.40 = 239.20 : x
  2. Step 2: Convert to fraction form
    386.44/533.40 = 239.20/x
  3. Step 3: Cross multiply
    386.44x = 533.40 × 239.20
  4. Step 4: Simplify right side
    386.44x = 127,589.28
  5. Step 5: Solve for x
    x = 127,589.28/386.44
  6. Step 6: Final answer
    x = 330.17

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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.