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Finding the Fourth Proportional to 207.71, 311.66 and 85.95

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Solution

The fourth proportional to 207.71, 311.66 and 85.95 is: 128.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.71 : 311.66 = 85.95 : x
  2. Step 2: Convert to fraction form
    207.71/311.66 = 85.95/x
  3. Step 3: Cross multiply
    207.71x = 311.66 × 85.95
  4. Step 4: Simplify right side
    207.71x = 26,786.75
  5. Step 5: Solve for x
    x = 26,786.75/207.71
  6. Step 6: Final answer
    x = 128.97

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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.