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Finding the Fourth Proportional to 108.38, 162.49 and 85.66

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Solution

The fourth proportional to 108.38, 162.49 and 85.66 is: 128.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.38 : 162.49 = 85.66 : x
  2. Step 2: Convert to fraction form
    108.38/162.49 = 85.66/x
  3. Step 3: Cross multiply
    108.38x = 162.49 × 85.66
  4. Step 4: Simplify right side
    108.38x = 13,918.25
  5. Step 5: Solve for x
    x = 13,918.25/108.38
  6. Step 6: Final answer
    x = 128.42

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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.