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Finding the Fourth Proportional to 386.92, 533.79 and 239.30

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Solution

The fourth proportional to 386.92, 533.79 and 239.30 is: 330.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.92 : 533.79 = 239.30 : x
  2. Step 2: Convert to fraction form
    386.92/533.79 = 239.30/x
  3. Step 3: Cross multiply
    386.92x = 533.79 × 239.30
  4. Step 4: Simplify right side
    386.92x = 127,733.28
  5. Step 5: Solve for x
    x = 127,733.28/386.92
  6. Step 6: Final answer
    x = 330.13

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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.