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Finding the Fourth Proportional to 107.66, 161.51 and 67.11

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Solution

The fourth proportional to 107.66, 161.51 and 67.11 is: 100.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.66 : 161.51 = 67.11 : x
  2. Step 2: Convert to fraction form
    107.66/161.51 = 67.11/x
  3. Step 3: Cross multiply
    107.66x = 161.51 × 67.11
  4. Step 4: Simplify right side
    107.66x = 10,838.94
  5. Step 5: Solve for x
    x = 10,838.94/107.66
  6. Step 6: Final answer
    x = 100.68

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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.