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Finding the Fourth Proportional to 405.73, 559.90 and 231.09

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Solution

The fourth proportional to 405.73, 559.90 and 231.09 is: 318.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.73 : 559.90 = 231.09 : x
  2. Step 2: Convert to fraction form
    405.73/559.90 = 231.09/x
  3. Step 3: Cross multiply
    405.73x = 559.90 × 231.09
  4. Step 4: Simplify right side
    405.73x = 129,387.29
  5. Step 5: Solve for x
    x = 129,387.29/405.73
  6. Step 6: Final answer
    x = 318.90

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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.