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Finding the Fourth Proportional to 405.75, 559.74 and 239.91

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Solution

The fourth proportional to 405.75, 559.74 and 239.91 is: 330.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.75 : 559.74 = 239.91 : x
  2. Step 2: Convert to fraction form
    405.75/559.74 = 239.91/x
  3. Step 3: Cross multiply
    405.75x = 559.74 × 239.91
  4. Step 4: Simplify right side
    405.75x = 134,287.22
  5. Step 5: Solve for x
    x = 134,287.22/405.75
  6. Step 6: Final answer
    x = 330.96

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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.