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Finding the Fourth Proportional to 405.04, 559 and 239.31

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Solution

The fourth proportional to 405.04, 559 and 239.31 is: 330.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.04 : 559 = 239.31 : x
  2. Step 2: Convert to fraction form
    405.04/559 = 239.31/x
  3. Step 3: Cross multiply
    405.04x = 559 × 239.31
  4. Step 4: Simplify right side
    405.04x = 133,774.29
  5. Step 5: Solve for x
    x = 133,774.29/405.04
  6. Step 6: Final answer
    x = 330.27

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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.