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Finding the Fourth Proportional to 354.28, 488.91 and 206.89

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Solution

The fourth proportional to 354.28, 488.91 and 206.89 is: 285.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.28 : 488.91 = 206.89 : x
  2. Step 2: Convert to fraction form
    354.28/488.91 = 206.89/x
  3. Step 3: Cross multiply
    354.28x = 488.91 × 206.89
  4. Step 4: Simplify right side
    354.28x = 101,147.11
  5. Step 5: Solve for x
    x = 101,147.11/354.28
  6. Step 6: Final answer
    x = 285.50

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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.