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Finding the Fourth Proportional to 208, 311.90 and 99.84

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Solution

The fourth proportional to 208, 311.90 and 99.84 is: 149.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    208 : 311.90 = 99.84 : x
  2. Step 2: Convert to fraction form
    208/311.90 = 99.84/x
  3. Step 3: Cross multiply
    208x = 311.90 × 99.84
  4. Step 4: Simplify right side
    208x = 31,140.10
  5. Step 5: Solve for x
    x = 31,140.10/208
  6. Step 6: Final answer
    x = 149.71

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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.