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Finding the Fourth Proportional to 108, 161.46 and 82.08

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Solution

The fourth proportional to 108, 161.46 and 82.08 is: 122.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    108 : 161.46 = 82.08 : x
  2. Step 2: Convert to fraction form
    108/161.46 = 82.08/x
  3. Step 3: Cross multiply
    108x = 161.46 × 82.08
  4. Step 4: Simplify right side
    108x = 13,252.64
  5. Step 5: Solve for x
    x = 13,252.64/108
  6. Step 6: Final answer
    x = 122.71

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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.