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Finding the Fourth Proportional to 211.33, 316.86 and 81.33

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Solution

The fourth proportional to 211.33, 316.86 and 81.33 is: 121.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.33 : 316.86 = 81.33 : x
  2. Step 2: Convert to fraction form
    211.33/316.86 = 81.33/x
  3. Step 3: Cross multiply
    211.33x = 316.86 × 81.33
  4. Step 4: Simplify right side
    211.33x = 25,770.22
  5. Step 5: Solve for x
    x = 25,770.22/211.33
  6. Step 6: Final answer
    x = 121.94

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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.