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Finding the Fourth Proportional to 208.72, 289.27 and 205.60

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Solution

The fourth proportional to 208.72, 289.27 and 205.60 is: 284.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.72 : 289.27 = 205.60 : x
  2. Step 2: Convert to fraction form
    208.72/289.27 = 205.60/x
  3. Step 3: Cross multiply
    208.72x = 289.27 × 205.60
  4. Step 4: Simplify right side
    208.72x = 59,473.91
  5. Step 5: Solve for x
    x = 59,473.91/208.72
  6. Step 6: Final answer
    x = 284.95

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.