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Finding the Fourth Proportional to 212.82, 318.87 and 131.46

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Solution

The fourth proportional to 212.82, 318.87 and 131.46 is: 196.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.82 : 318.87 = 131.46 : x
  2. Step 2: Convert to fraction form
    212.82/318.87 = 131.46/x
  3. Step 3: Cross multiply
    212.82x = 318.87 × 131.46
  4. Step 4: Simplify right side
    212.82x = 41,918.65
  5. Step 5: Solve for x
    x = 41,918.65/212.82
  6. Step 6: Final answer
    x = 196.97

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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.