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Finding the Fourth Proportional to 144.05, 215.97 and 71.81

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Solution

The fourth proportional to 144.05, 215.97 and 71.81 is: 107.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.05 : 215.97 = 71.81 : x
  2. Step 2: Convert to fraction form
    144.05/215.97 = 71.81/x
  3. Step 3: Cross multiply
    144.05x = 215.97 × 71.81
  4. Step 4: Simplify right side
    144.05x = 15,508.81
  5. Step 5: Solve for x
    x = 15,508.81/144.05
  6. Step 6: Final answer
    x = 107.66

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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.