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Finding the Fourth Proportional to 386.87, 533.70 and 239.45

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Solution

The fourth proportional to 386.87, 533.70 and 239.45 is: 330.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.87 : 533.70 = 239.45 : x
  2. Step 2: Convert to fraction form
    386.87/533.70 = 239.45/x
  3. Step 3: Cross multiply
    386.87x = 533.70 × 239.45
  4. Step 4: Simplify right side
    386.87x = 127,794.47
  5. Step 5: Solve for x
    x = 127,794.47/386.87
  6. Step 6: Final answer
    x = 330.33

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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.