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Finding the Fourth Proportional to 118.70, 163.78 and 71.42

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Solution

The fourth proportional to 118.70, 163.78 and 71.42 is: 98.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.70 : 163.78 = 71.42 : x
  2. Step 2: Convert to fraction form
    118.70/163.78 = 71.42/x
  3. Step 3: Cross multiply
    118.70x = 163.78 × 71.42
  4. Step 4: Simplify right side
    118.70x = 11,696.22
  5. Step 5: Solve for x
    x = 11,696.22/118.70
  6. Step 6: Final answer
    x = 98.54

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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.