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Finding the Fourth Proportional to 211.41, 316.97 and 108.65

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Solution

The fourth proportional to 211.41, 316.97 and 108.65 is: 162.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.41 : 316.97 = 108.65 : x
  2. Step 2: Convert to fraction form
    211.41/316.97 = 108.65/x
  3. Step 3: Cross multiply
    211.41x = 316.97 × 108.65
  4. Step 4: Simplify right side
    211.41x = 34,436.66
  5. Step 5: Solve for x
    x = 34,436.66/211.41
  6. Step 6: Final answer
    x = 162.89

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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.