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Finding the Fourth Proportional to 107.94, 161.78 and 67.31

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Solution

The fourth proportional to 107.94, 161.78 and 67.31 is: 100.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.94 : 161.78 = 67.31 : x
  2. Step 2: Convert to fraction form
    107.94/161.78 = 67.31/x
  3. Step 3: Cross multiply
    107.94x = 161.78 × 67.31
  4. Step 4: Simplify right side
    107.94x = 10,888.27
  5. Step 5: Solve for x
    x = 10,888.27/107.94
  6. Step 6: Final answer
    x = 100.87

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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.