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Finding the Fourth Proportional to 108.28, 149.44 and 66.82

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Solution

The fourth proportional to 108.28, 149.44 and 66.82 is: 92.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.28 : 149.44 = 66.82 : x
  2. Step 2: Convert to fraction form
    108.28/149.44 = 66.82/x
  3. Step 3: Cross multiply
    108.28x = 149.44 × 66.82
  4. Step 4: Simplify right side
    108.28x = 9,985.58
  5. Step 5: Solve for x
    x = 9,985.58/108.28
  6. Step 6: Final answer
    x = 92.22

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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.