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Finding the Fourth Proportional to 354.21, 488.77 and 206.85

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Solution

The fourth proportional to 354.21, 488.77 and 206.85 is: 285.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.21 : 488.77 = 206.85 : x
  2. Step 2: Convert to fraction form
    354.21/488.77 = 206.85/x
  3. Step 3: Cross multiply
    354.21x = 488.77 × 206.85
  4. Step 4: Simplify right side
    354.21x = 101,103.39
  5. Step 5: Solve for x
    x = 101,103.39/354.21
  6. Step 6: Final answer
    x = 285.44

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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.