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Finding the Fourth Proportional to 144.99, 217.49 and 81.27

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Solution

The fourth proportional to 144.99, 217.49 and 81.27 is: 121.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.99 : 217.49 = 81.27 : x
  2. Step 2: Convert to fraction form
    144.99/217.49 = 81.27/x
  3. Step 3: Cross multiply
    144.99x = 217.49 × 81.27
  4. Step 4: Simplify right side
    144.99x = 17,675.01
  5. Step 5: Solve for x
    x = 17,675.01/144.99
  6. Step 6: Final answer
    x = 121.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.