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Finding the Fourth Proportional to 76.45, 105.27 and 66.73

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Solution

The fourth proportional to 76.45, 105.27 and 66.73 is: 91.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.45 : 105.27 = 66.73 : x
  2. Step 2: Convert to fraction form
    76.45/105.27 = 66.73/x
  3. Step 3: Cross multiply
    76.45x = 105.27 × 66.73
  4. Step 4: Simplify right side
    76.45x = 7,024.14
  5. Step 5: Solve for x
    x = 7,024.14/76.45
  6. Step 6: Final answer
    x = 91.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.