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Finding the Fourth Proportional to 404.80, 558.80 and 257.44

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Solution

The fourth proportional to 404.80, 558.80 and 257.44 is: 355.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.80 : 558.80 = 257.44 : x
  2. Step 2: Convert to fraction form
    404.80/558.80 = 257.44/x
  3. Step 3: Cross multiply
    404.80x = 558.80 × 257.44
  4. Step 4: Simplify right side
    404.80x = 143,857.47
  5. Step 5: Solve for x
    x = 143,857.47/404.80
  6. Step 6: Final answer
    x = 355.38

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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.