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Finding the Fourth Proportional to 208.35, 311.89 and 131.05

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Solution

The fourth proportional to 208.35, 311.89 and 131.05 is: 196.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.35 : 311.89 = 131.05 : x
  2. Step 2: Convert to fraction form
    208.35/311.89 = 131.05/x
  3. Step 3: Cross multiply
    208.35x = 311.89 × 131.05
  4. Step 4: Simplify right side
    208.35x = 40,873.18
  5. Step 5: Solve for x
    x = 40,873.18/208.35
  6. Step 6: Final answer
    x = 196.18

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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.