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Finding the Fourth Proportional to 278.97, 385.49 and 209.27

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Solution

The fourth proportional to 278.97, 385.49 and 209.27 is: 289.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.97 : 385.49 = 209.27 : x
  2. Step 2: Convert to fraction form
    278.97/385.49 = 209.27/x
  3. Step 3: Cross multiply
    278.97x = 385.49 × 209.27
  4. Step 4: Simplify right side
    278.97x = 80,668.52
  5. Step 5: Solve for x
    x = 80,668.52/278.97
  6. Step 6: Final answer
    x = 289.17

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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.