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Finding the Fourth Proportional to 404.87, 558.70 and 239.18

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Solution

The fourth proportional to 404.87, 558.70 and 239.18 is: 330.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.87 : 558.70 = 239.18 : x
  2. Step 2: Convert to fraction form
    404.87/558.70 = 239.18/x
  3. Step 3: Cross multiply
    404.87x = 558.70 × 239.18
  4. Step 4: Simplify right side
    404.87x = 133,626.47
  5. Step 5: Solve for x
    x = 133,626.47/404.87
  6. Step 6: Final answer
    x = 330.05

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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.