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Finding the Fourth Proportional to 404.08, 557.80 and 355.48

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Solution

The fourth proportional to 404.08, 557.80 and 355.48 is: 490.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.08 : 557.80 = 355.48 : x
  2. Step 2: Convert to fraction form
    404.08/557.80 = 355.48/x
  3. Step 3: Cross multiply
    404.08x = 557.80 × 355.48
  4. Step 4: Simplify right side
    404.08x = 198,286.74
  5. Step 5: Solve for x
    x = 198,286.74/404.08
  6. Step 6: Final answer
    x = 490.71

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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.