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Finding the Fourth Proportional to 76.91, 114.81 and 71.27

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Solution

The fourth proportional to 76.91, 114.81 and 71.27 is: 106.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.91 : 114.81 = 71.27 : x
  2. Step 2: Convert to fraction form
    76.91/114.81 = 71.27/x
  3. Step 3: Cross multiply
    76.91x = 114.81 × 71.27
  4. Step 4: Simplify right side
    76.91x = 8,181.93
  5. Step 5: Solve for x
    x = 8,181.93/76.91
  6. Step 6: Final answer
    x = 106.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.