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Finding the Fourth Proportional to 386.67, 533.45 and 239.05

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Solution

The fourth proportional to 386.67, 533.45 and 239.05 is: 329.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.67 : 533.45 = 239.05 : x
  2. Step 2: Convert to fraction form
    386.67/533.45 = 239.05/x
  3. Step 3: Cross multiply
    386.67x = 533.45 × 239.05
  4. Step 4: Simplify right side
    386.67x = 127,517.36
  5. Step 5: Solve for x
    x = 127,517.36/386.67
  6. Step 6: Final answer
    x = 329.78

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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.