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Finding the Fourth Proportional to 108.24, 161.12 and 103.72

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Solution

The fourth proportional to 108.24, 161.12 and 103.72 is: 154.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.24 : 161.12 = 103.72 : x
  2. Step 2: Convert to fraction form
    108.24/161.12 = 103.72/x
  3. Step 3: Cross multiply
    108.24x = 161.12 × 103.72
  4. Step 4: Simplify right side
    108.24x = 16,711.37
  5. Step 5: Solve for x
    x = 16,711.37/108.24
  6. Step 6: Final answer
    x = 154.39

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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.