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Finding the Fourth Proportional to 208.72, 311.09 and 203.86

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Solution

The fourth proportional to 208.72, 311.09 and 203.86 is: 303.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.72 : 311.09 = 203.86 : x
  2. Step 2: Convert to fraction form
    208.72/311.09 = 203.86/x
  3. Step 3: Cross multiply
    208.72x = 311.09 × 203.86
  4. Step 4: Simplify right side
    208.72x = 63,418.81
  5. Step 5: Solve for x
    x = 63,418.81/208.72
  6. Step 6: Final answer
    x = 303.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.