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Finding the Fourth Proportional to 84.48, 126.89 and 71.72

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Solution

The fourth proportional to 84.48, 126.89 and 71.72 is: 107.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.48 : 126.89 = 71.72 : x
  2. Step 2: Convert to fraction form
    84.48/126.89 = 71.72/x
  3. Step 3: Cross multiply
    84.48x = 126.89 × 71.72
  4. Step 4: Simplify right side
    84.48x = 9,099.56
  5. Step 5: Solve for x
    x = 9,099.56/84.48
  6. Step 6: Final answer
    x = 107.71

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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.