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Finding the Fourth Proportional to 386.94, 534.23 and 239.79

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Solution

The fourth proportional to 386.94, 534.23 and 239.79 is: 331.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.94 : 534.23 = 239.79 : x
  2. Step 2: Convert to fraction form
    386.94/534.23 = 239.79/x
  3. Step 3: Cross multiply
    386.94x = 534.23 × 239.79
  4. Step 4: Simplify right side
    386.94x = 128,103.01
  5. Step 5: Solve for x
    x = 128,103.01/386.94
  6. Step 6: Final answer
    x = 331.07

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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.