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Finding the Fourth Proportional to 144.88, 217.40 and 80.76

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Solution

The fourth proportional to 144.88, 217.40 and 80.76 is: 121.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.88 : 217.40 = 80.76 : x
  2. Step 2: Convert to fraction form
    144.88/217.40 = 80.76/x
  3. Step 3: Cross multiply
    144.88x = 217.40 × 80.76
  4. Step 4: Simplify right side
    144.88x = 17,557.22
  5. Step 5: Solve for x
    x = 17,557.22/144.88
  6. Step 6: Final answer
    x = 121.18

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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.