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Finding the Fourth Proportional to 108.80, 163.04 and 90.56

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Solution

The fourth proportional to 108.80, 163.04 and 90.56 is: 135.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.80 : 163.04 = 90.56 : x
  2. Step 2: Convert to fraction form
    108.80/163.04 = 90.56/x
  3. Step 3: Cross multiply
    108.80x = 163.04 × 90.56
  4. Step 4: Simplify right side
    108.80x = 14,764.90
  5. Step 5: Solve for x
    x = 14,764.90/108.80
  6. Step 6: Final answer
    x = 135.71

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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.