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Finding the Fourth Proportional to 108.18, 161.93 and 86.43

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Solution

The fourth proportional to 108.18, 161.93 and 86.43 is: 129.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.18 : 161.93 = 86.43 : x
  2. Step 2: Convert to fraction form
    108.18/161.93 = 86.43/x
  3. Step 3: Cross multiply
    108.18x = 161.93 × 86.43
  4. Step 4: Simplify right side
    108.18x = 13,995.18
  5. Step 5: Solve for x
    x = 13,995.18/108.18
  6. Step 6: Final answer
    x = 129.37

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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.