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Finding the Fourth Proportional to 108.59, 163.62 and 89.75

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Solution

The fourth proportional to 108.59, 163.62 and 89.75 is: 135.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.59 : 163.62 = 89.75 : x
  2. Step 2: Convert to fraction form
    108.59/163.62 = 89.75/x
  3. Step 3: Cross multiply
    108.59x = 163.62 × 89.75
  4. Step 4: Simplify right side
    108.59x = 14,684.90
  5. Step 5: Solve for x
    x = 14,684.90/108.59
  6. Step 6: Final answer
    x = 135.23

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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.