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Finding the Fourth Proportional to 191.33, 286.94 and 81.64

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Solution

The fourth proportional to 191.33, 286.94 and 81.64 is: 122.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.33 : 286.94 = 81.64 : x
  2. Step 2: Convert to fraction form
    191.33/286.94 = 81.64/x
  3. Step 3: Cross multiply
    191.33x = 286.94 × 81.64
  4. Step 4: Simplify right side
    191.33x = 23,425.73
  5. Step 5: Solve for x
    x = 23,425.73/191.33
  6. Step 6: Final answer
    x = 122.44

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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.