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Finding the Fourth Proportional to 118.23, 163.13 and 76.79

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Solution

The fourth proportional to 118.23, 163.13 and 76.79 is: 105.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.23 : 163.13 = 76.79 : x
  2. Step 2: Convert to fraction form
    118.23/163.13 = 76.79/x
  3. Step 3: Cross multiply
    118.23x = 163.13 × 76.79
  4. Step 4: Simplify right side
    118.23x = 12,525.55
  5. Step 5: Solve for x
    x = 12,525.55/118.23
  6. Step 6: Final answer
    x = 105.94

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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.