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Finding the Fourth Proportional to 211.26, 315.41 and 198.98

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Solution

The fourth proportional to 211.26, 315.41 and 198.98 is: 297.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.26 : 315.41 = 198.98 : x
  2. Step 2: Convert to fraction form
    211.26/315.41 = 198.98/x
  3. Step 3: Cross multiply
    211.26x = 315.41 × 198.98
  4. Step 4: Simplify right side
    211.26x = 62,759.20
  5. Step 5: Solve for x
    x = 62,759.20/211.26
  6. Step 6: Final answer
    x = 297.07

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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.