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Finding the Fourth Proportional to 118.69, 163.91 and 77.23

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Solution

The fourth proportional to 118.69, 163.91 and 77.23 is: 106.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.69 : 163.91 = 77.23 : x
  2. Step 2: Convert to fraction form
    118.69/163.91 = 77.23/x
  3. Step 3: Cross multiply
    118.69x = 163.91 × 77.23
  4. Step 4: Simplify right side
    118.69x = 12,658.60
  5. Step 5: Solve for x
    x = 12,658.60/118.69
  6. Step 6: Final answer
    x = 106.65

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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.