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Finding the Fourth Proportional to 108.92, 163.99 and 90.80

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Solution

The fourth proportional to 108.92, 163.99 and 90.80 is: 136.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.92 : 163.99 = 90.80 : x
  2. Step 2: Convert to fraction form
    108.92/163.99 = 90.80/x
  3. Step 3: Cross multiply
    108.92x = 163.99 × 90.80
  4. Step 4: Simplify right side
    108.92x = 14,890.29
  5. Step 5: Solve for x
    x = 14,890.29/108.92
  6. Step 6: Final answer
    x = 136.71

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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.