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Finding the Fourth Proportional to 208.13, 311.61 and 139.56

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Solution

The fourth proportional to 208.13, 311.61 and 139.56 is: 208.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.13 : 311.61 = 139.56 : x
  2. Step 2: Convert to fraction form
    208.13/311.61 = 139.56/x
  3. Step 3: Cross multiply
    208.13x = 311.61 × 139.56
  4. Step 4: Simplify right side
    208.13x = 43,488.29
  5. Step 5: Solve for x
    x = 43,488.29/208.13
  6. Step 6: Final answer
    x = 208.95

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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.