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Finding the Fourth Proportional to 207.96, 311.57 and 126.76

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Solution

The fourth proportional to 207.96, 311.57 and 126.76 is: 189.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.96 : 311.57 = 126.76 : x
  2. Step 2: Convert to fraction form
    207.96/311.57 = 126.76/x
  3. Step 3: Cross multiply
    207.96x = 311.57 × 126.76
  4. Step 4: Simplify right side
    207.96x = 39,494.61
  5. Step 5: Solve for x
    x = 39,494.61/207.96
  6. Step 6: Final answer
    x = 189.91

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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.