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Finding the Fourth Proportional to 404.85, 558.31 and 239.07

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Solution

The fourth proportional to 404.85, 558.31 and 239.07 is: 329.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.85 : 558.31 = 239.07 : x
  2. Step 2: Convert to fraction form
    404.85/558.31 = 239.07/x
  3. Step 3: Cross multiply
    404.85x = 558.31 × 239.07
  4. Step 4: Simplify right side
    404.85x = 133,475.17
  5. Step 5: Solve for x
    x = 133,475.17/404.85
  6. Step 6: Final answer
    x = 329.69

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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.