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Finding the Fourth Proportional to 208.39, 312.26 and 131.34

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Solution

The fourth proportional to 208.39, 312.26 and 131.34 is: 196.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.39 : 312.26 = 131.34 : x
  2. Step 2: Convert to fraction form
    208.39/312.26 = 131.34/x
  3. Step 3: Cross multiply
    208.39x = 312.26 × 131.34
  4. Step 4: Simplify right side
    208.39x = 41,010.99
  5. Step 5: Solve for x
    x = 41,010.99/208.39
  6. Step 6: Final answer
    x = 196.80

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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.