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Finding the Fourth Proportional to 108.81, 163.52 and 90.64

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Solution

The fourth proportional to 108.81, 163.52 and 90.64 is: 136.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.81 : 163.52 = 90.64 : x
  2. Step 2: Convert to fraction form
    108.81/163.52 = 90.64/x
  3. Step 3: Cross multiply
    108.81x = 163.52 × 90.64
  4. Step 4: Simplify right side
    108.81x = 14,820.18
  5. Step 5: Solve for x
    x = 14,820.18/108.81
  6. Step 6: Final answer
    x = 136.21

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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.