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Finding the Fourth Proportional to 405.76, 559.88 and 239.92

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Solution

The fourth proportional to 405.76, 559.88 and 239.92 is: 331.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.76 : 559.88 = 239.92 : x
  2. Step 2: Convert to fraction form
    405.76/559.88 = 239.92/x
  3. Step 3: Cross multiply
    405.76x = 559.88 × 239.92
  4. Step 4: Simplify right side
    405.76x = 134,326.41
  5. Step 5: Solve for x
    x = 134,326.41/405.76
  6. Step 6: Final answer
    x = 331.05

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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.