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Finding the Fourth Proportional to 118.21, 163.20 and 93.73

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Solution

The fourth proportional to 118.21, 163.20 and 93.73 is: 129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.21 : 163.20 = 93.73 : x
  2. Step 2: Convert to fraction form
    118.21/163.20 = 93.73/x
  3. Step 3: Cross multiply
    118.21x = 163.20 × 93.73
  4. Step 4: Simplify right side
    118.21x = 15,296.74
  5. Step 5: Solve for x
    x = 15,296.74/118.21
  6. Step 6: Final answer
    x = 129.40

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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.