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Finding the Fourth Proportional to 89.14, 133.54 and 71.95

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Solution

The fourth proportional to 89.14, 133.54 and 71.95 is: 107.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.14 : 133.54 = 71.95 : x
  2. Step 2: Convert to fraction form
    89.14/133.54 = 71.95/x
  3. Step 3: Cross multiply
    89.14x = 133.54 × 71.95
  4. Step 4: Simplify right side
    89.14x = 9,608.20
  5. Step 5: Solve for x
    x = 9,608.20/89.14
  6. Step 6: Final answer
    x = 107.79

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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.