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Finding the Fourth Proportional to 211.14, 316.82 and 82.88

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Solution

The fourth proportional to 211.14, 316.82 and 82.88 is: 124.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.14 : 316.82 = 82.88 : x
  2. Step 2: Convert to fraction form
    211.14/316.82 = 82.88/x
  3. Step 3: Cross multiply
    211.14x = 316.82 × 82.88
  4. Step 4: Simplify right side
    211.14x = 26,258.04
  5. Step 5: Solve for x
    x = 26,258.04/211.14
  6. Step 6: Final answer
    x = 124.36

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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.