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Finding the Fourth Proportional to 207.58, 311.39 and 68.74

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Solution

The fourth proportional to 207.58, 311.39 and 68.74 is: 103.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.58 : 311.39 = 68.74 : x
  2. Step 2: Convert to fraction form
    207.58/311.39 = 68.74/x
  3. Step 3: Cross multiply
    207.58x = 311.39 × 68.74
  4. Step 4: Simplify right side
    207.58x = 21,404.95
  5. Step 5: Solve for x
    x = 21,404.95/207.58
  6. Step 6: Final answer
    x = 103.12

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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.