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Finding the Fourth Proportional to 108.12, 161.97 and 85.19

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Solution

The fourth proportional to 108.12, 161.97 and 85.19 is: 127.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.12 : 161.97 = 85.19 : x
  2. Step 2: Convert to fraction form
    108.12/161.97 = 85.19/x
  3. Step 3: Cross multiply
    108.12x = 161.97 × 85.19
  4. Step 4: Simplify right side
    108.12x = 13,798.22
  5. Step 5: Solve for x
    x = 13,798.22/108.12
  6. Step 6: Final answer
    x = 127.62

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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.