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Finding the Fourth Proportional to 108.11, 161.94 and 73.78

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Solution

The fourth proportional to 108.11, 161.94 and 73.78 is: 110.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.11 : 161.94 = 73.78 : x
  2. Step 2: Convert to fraction form
    108.11/161.94 = 73.78/x
  3. Step 3: Cross multiply
    108.11x = 161.94 × 73.78
  4. Step 4: Simplify right side
    108.11x = 11,948.27
  5. Step 5: Solve for x
    x = 11,948.27/108.11
  6. Step 6: Final answer
    x = 110.52

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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.