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Finding the Fourth Proportional to 118.70, 163.89 and 89.73

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Solution

The fourth proportional to 118.70, 163.89 and 89.73 is: 123.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.70 : 163.89 = 89.73 : x
  2. Step 2: Convert to fraction form
    118.70/163.89 = 89.73/x
  3. Step 3: Cross multiply
    118.70x = 163.89 × 89.73
  4. Step 4: Simplify right side
    118.70x = 14,705.85
  5. Step 5: Solve for x
    x = 14,705.85/118.70
  6. Step 6: Final answer
    x = 123.90

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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.