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Finding the Fourth Proportional to 212.26, 316.86 and 198.62

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Solution

The fourth proportional to 212.26, 316.86 and 198.62 is: 296.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.26 : 316.86 = 198.62 : x
  2. Step 2: Convert to fraction form
    212.26/316.86 = 198.62/x
  3. Step 3: Cross multiply
    212.26x = 316.86 × 198.62
  4. Step 4: Simplify right side
    212.26x = 62,934.73
  5. Step 5: Solve for x
    x = 62,934.73/212.26
  6. Step 6: Final answer
    x = 296.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.