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Finding the Fourth Proportional to 405.54, 559.61 and 239.79

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Solution

The fourth proportional to 405.54, 559.61 and 239.79 is: 330.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.54 : 559.61 = 239.79 : x
  2. Step 2: Convert to fraction form
    405.54/559.61 = 239.79/x
  3. Step 3: Cross multiply
    405.54x = 559.61 × 239.79
  4. Step 4: Simplify right side
    405.54x = 134,187.68
  5. Step 5: Solve for x
    x = 134,187.68/405.54
  6. Step 6: Final answer
    x = 330.89

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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.