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Finding the Fourth Proportional to 144.11, 215.96 and 71.88

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Solution

The fourth proportional to 144.11, 215.96 and 71.88 is: 107.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.11 : 215.96 = 71.88 : x
  2. Step 2: Convert to fraction form
    144.11/215.96 = 71.88/x
  3. Step 3: Cross multiply
    144.11x = 215.96 × 71.88
  4. Step 4: Simplify right side
    144.11x = 15,522.85
  5. Step 5: Solve for x
    x = 15,522.85/144.11
  6. Step 6: Final answer
    x = 107.72

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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.