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Finding the Fourth Proportional to 108.05, 161.32 and 106.91

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Solution

The fourth proportional to 108.05, 161.32 and 106.91 is: 159.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.05 : 161.32 = 106.91 : x
  2. Step 2: Convert to fraction form
    108.05/161.32 = 106.91/x
  3. Step 3: Cross multiply
    108.05x = 161.32 × 106.91
  4. Step 4: Simplify right side
    108.05x = 17,246.72
  5. Step 5: Solve for x
    x = 17,246.72/108.05
  6. Step 6: Final answer
    x = 159.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.