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Finding the Fourth Proportional to 108.40, 161.82 and 100.37

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Solution

The fourth proportional to 108.40, 161.82 and 100.37 is: 149.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.40 : 161.82 = 100.37 : x
  2. Step 2: Convert to fraction form
    108.40/161.82 = 100.37/x
  3. Step 3: Cross multiply
    108.40x = 161.82 × 100.37
  4. Step 4: Simplify right side
    108.40x = 16,242.03
  5. Step 5: Solve for x
    x = 16,242.03/108.40
  6. Step 6: Final answer
    x = 149.83

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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.