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Finding the Fourth Proportional to 211.26, 316.90 and 119.75

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Solution

The fourth proportional to 211.26, 316.90 and 119.75 is: 179.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.26 : 316.90 = 119.75 : x
  2. Step 2: Convert to fraction form
    211.26/316.90 = 119.75/x
  3. Step 3: Cross multiply
    211.26x = 316.90 × 119.75
  4. Step 4: Simplify right side
    211.26x = 37,948.78
  5. Step 5: Solve for x
    x = 37,948.78/211.26
  6. Step 6: Final answer
    x = 179.63

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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.