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Finding the Fourth Proportional to 404.46, 558.60 and 355.20

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Solution

The fourth proportional to 404.46, 558.60 and 355.20 is: 490.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.46 : 558.60 = 355.20 : x
  2. Step 2: Convert to fraction form
    404.46/558.60 = 355.20/x
  3. Step 3: Cross multiply
    404.46x = 558.60 × 355.20
  4. Step 4: Simplify right side
    404.46x = 198,414.72
  5. Step 5: Solve for x
    x = 198,414.72/404.46
  6. Step 6: Final answer
    x = 490.57

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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.