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Finding the Fourth Proportional to 207.91, 311.52 and 92.18

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Solution

The fourth proportional to 207.91, 311.52 and 92.18 is: 138.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.91 : 311.52 = 92.18 : x
  2. Step 2: Convert to fraction form
    207.91/311.52 = 92.18/x
  3. Step 3: Cross multiply
    207.91x = 311.52 × 92.18
  4. Step 4: Simplify right side
    207.91x = 28,715.91
  5. Step 5: Solve for x
    x = 28,715.91/207.91
  6. Step 6: Final answer
    x = 138.12

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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.