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Finding the Fourth Proportional to 118.21, 163.03 and 93.61

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Solution

The fourth proportional to 118.21, 163.03 and 93.61 is: 129.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.21 : 163.03 = 93.61 : x
  2. Step 2: Convert to fraction form
    118.21/163.03 = 93.61/x
  3. Step 3: Cross multiply
    118.21x = 163.03 × 93.61
  4. Step 4: Simplify right side
    118.21x = 15,261.24
  5. Step 5: Solve for x
    x = 15,261.24/118.21
  6. Step 6: Final answer
    x = 129.10

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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.