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Finding the Fourth Proportional to 404.99, 558.78 and 239.13

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Solution

The fourth proportional to 404.99, 558.78 and 239.13 is: 329.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.99 : 558.78 = 239.13 : x
  2. Step 2: Convert to fraction form
    404.99/558.78 = 239.13/x
  3. Step 3: Cross multiply
    404.99x = 558.78 × 239.13
  4. Step 4: Simplify right side
    404.99x = 133,621.06
  5. Step 5: Solve for x
    x = 133,621.06/404.99
  6. Step 6: Final answer
    x = 329.94

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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.