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Finding the Fourth Proportional to 108.87, 163.13 and 90.64

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Solution

The fourth proportional to 108.87, 163.13 and 90.64 is: 135.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.87 : 163.13 = 90.64 : x
  2. Step 2: Convert to fraction form
    108.87/163.13 = 90.64/x
  3. Step 3: Cross multiply
    108.87x = 163.13 × 90.64
  4. Step 4: Simplify right side
    108.87x = 14,786.10
  5. Step 5: Solve for x
    x = 14,786.10/108.87
  6. Step 6: Final answer
    x = 135.81

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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.