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Finding the Fourth Proportional to 118.76, 163.86 and 81.90

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Solution

The fourth proportional to 118.76, 163.86 and 81.90 is: 113.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.76 : 163.86 = 81.90 : x
  2. Step 2: Convert to fraction form
    118.76/163.86 = 81.90/x
  3. Step 3: Cross multiply
    118.76x = 163.86 × 81.90
  4. Step 4: Simplify right side
    118.76x = 13,420.13
  5. Step 5: Solve for x
    x = 13,420.13/118.76
  6. Step 6: Final answer
    x = 113.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.