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Finding the Fourth Proportional to 191.28, 286.78 and 67.84

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Solution

The fourth proportional to 191.28, 286.78 and 67.84 is: 101.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.28 : 286.78 = 67.84 : x
  2. Step 2: Convert to fraction form
    191.28/286.78 = 67.84/x
  3. Step 3: Cross multiply
    191.28x = 286.78 × 67.84
  4. Step 4: Simplify right side
    191.28x = 19,455.16
  5. Step 5: Solve for x
    x = 19,455.16/191.28
  6. Step 6: Final answer
    x = 101.71

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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.