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Finding the Fourth Proportional to 404.28, 558.05 and 238.55

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Solution

The fourth proportional to 404.28, 558.05 and 238.55 is: 329.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.28 : 558.05 = 238.55 : x
  2. Step 2: Convert to fraction form
    404.28/558.05 = 238.55/x
  3. Step 3: Cross multiply
    404.28x = 558.05 × 238.55
  4. Step 4: Simplify right side
    404.28x = 133,118.84
  5. Step 5: Solve for x
    x = 133,118.84/404.28
  6. Step 6: Final answer
    x = 329.27

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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.