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Finding the Fourth Proportional to 355.11, 490.22 and 285.04

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Solution

The fourth proportional to 355.11, 490.22 and 285.04 is: 393.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.11 : 490.22 = 285.04 : x
  2. Step 2: Convert to fraction form
    355.11/490.22 = 285.04/x
  3. Step 3: Cross multiply
    355.11x = 490.22 × 285.04
  4. Step 4: Simplify right side
    355.11x = 139,732.31
  5. Step 5: Solve for x
    x = 139,732.31/355.11
  6. Step 6: Final answer
    x = 393.49

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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.