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Finding the Fourth Proportional to 118.14, 163.09 and 98.70

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Solution

The fourth proportional to 118.14, 163.09 and 98.70 is: 136.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.14 : 163.09 = 98.70 : x
  2. Step 2: Convert to fraction form
    118.14/163.09 = 98.70/x
  3. Step 3: Cross multiply
    118.14x = 163.09 × 98.70
  4. Step 4: Simplify right side
    118.14x = 16,096.17
  5. Step 5: Solve for x
    x = 16,096.17/118.14
  6. Step 6: Final answer
    x = 136.25

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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.