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Finding the Fourth Proportional to 405.38, 559.28 and 239.64

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Solution

The fourth proportional to 405.38, 559.28 and 239.64 is: 330.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.38 : 559.28 = 239.64 : x
  2. Step 2: Convert to fraction form
    405.38/559.28 = 239.64/x
  3. Step 3: Cross multiply
    405.38x = 559.28 × 239.64
  4. Step 4: Simplify right side
    405.38x = 134,024.66
  5. Step 5: Solve for x
    x = 134,024.66/405.38
  6. Step 6: Final answer
    x = 330.62

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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.