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Finding the Fourth Proportional to 108.69, 149.94 and 67.21

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Solution

The fourth proportional to 108.69, 149.94 and 67.21 is: 92.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.69 : 149.94 = 67.21 : x
  2. Step 2: Convert to fraction form
    108.69/149.94 = 67.21/x
  3. Step 3: Cross multiply
    108.69x = 149.94 × 67.21
  4. Step 4: Simplify right side
    108.69x = 10,077.13
  5. Step 5: Solve for x
    x = 10,077.13/108.69
  6. Step 6: Final answer
    x = 92.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.