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Finding the Fourth Proportional to 108.89, 163.99 and 91.88

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Solution

The fourth proportional to 108.89, 163.99 and 91.88 is: 138.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.89 : 163.99 = 91.88 : x
  2. Step 2: Convert to fraction form
    108.89/163.99 = 91.88/x
  3. Step 3: Cross multiply
    108.89x = 163.99 × 91.88
  4. Step 4: Simplify right side
    108.89x = 15,067.40
  5. Step 5: Solve for x
    x = 15,067.40/108.89
  6. Step 6: Final answer
    x = 138.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.