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Finding the Fourth Proportional to 108.76, 163.04 and 86.03

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Solution

The fourth proportional to 108.76, 163.04 and 86.03 is: 128.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.76 : 163.04 = 86.03 : x
  2. Step 2: Convert to fraction form
    108.76/163.04 = 86.03/x
  3. Step 3: Cross multiply
    108.76x = 163.04 × 86.03
  4. Step 4: Simplify right side
    108.76x = 14,026.33
  5. Step 5: Solve for x
    x = 14,026.33/108.76
  6. Step 6: Final answer
    x = 128.97

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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.