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Finding the Fourth Proportional to 218.38, 301.36 and 118.79

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Solution

The fourth proportional to 218.38, 301.36 and 118.79 is: 163.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.38 : 301.36 = 118.79 : x
  2. Step 2: Convert to fraction form
    218.38/301.36 = 118.79/x
  3. Step 3: Cross multiply
    218.38x = 301.36 × 118.79
  4. Step 4: Simplify right side
    218.38x = 35,798.41
  5. Step 5: Solve for x
    x = 35,798.41/218.38
  6. Step 6: Final answer
    x = 163.93

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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.