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Finding the Fourth Proportional to 207.72, 311.56 and 92.13

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Solution

The fourth proportional to 207.72, 311.56 and 92.13 is: 138.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.72 : 311.56 = 92.13 : x
  2. Step 2: Convert to fraction form
    207.72/311.56 = 92.13/x
  3. Step 3: Cross multiply
    207.72x = 311.56 × 92.13
  4. Step 4: Simplify right side
    207.72x = 28,704.02
  5. Step 5: Solve for x
    x = 28,704.02/207.72
  6. Step 6: Final answer
    x = 138.19

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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.