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Finding the Fourth Proportional to 405.12, 559.18 and 239.39

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Solution

The fourth proportional to 405.12, 559.18 and 239.39 is: 330.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.12 : 559.18 = 239.39 : x
  2. Step 2: Convert to fraction form
    405.12/559.18 = 239.39/x
  3. Step 3: Cross multiply
    405.12x = 559.18 × 239.39
  4. Step 4: Simplify right side
    405.12x = 133,862.30
  5. Step 5: Solve for x
    x = 133,862.30/405.12
  6. Step 6: Final answer
    x = 330.43

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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.