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Finding the Fourth Proportional to 405.21, 559.20 and 239.42

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Solution

The fourth proportional to 405.21, 559.20 and 239.42 is: 330.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.21 : 559.20 = 239.42 : x
  2. Step 2: Convert to fraction form
    405.21/559.20 = 239.42/x
  3. Step 3: Cross multiply
    405.21x = 559.20 × 239.42
  4. Step 4: Simplify right side
    405.21x = 133,884.16
  5. Step 5: Solve for x
    x = 133,884.16/405.21
  6. Step 6: Final answer
    x = 330.41

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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.