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Finding the Fourth Proportional to 211.38, 316.89 and 108.60

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Solution

The fourth proportional to 211.38, 316.89 and 108.60 is: 162.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.38 : 316.89 = 108.60 : x
  2. Step 2: Convert to fraction form
    211.38/316.89 = 108.60/x
  3. Step 3: Cross multiply
    211.38x = 316.89 × 108.60
  4. Step 4: Simplify right side
    211.38x = 34,414.25
  5. Step 5: Solve for x
    x = 34,414.25/211.38
  6. Step 6: Final answer
    x = 162.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.