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Finding the Fourth Proportional to 208.96, 311.62 and 185.65

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Solution

The fourth proportional to 208.96, 311.62 and 185.65 is: 276.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.96 : 311.62 = 185.65 : x
  2. Step 2: Convert to fraction form
    208.96/311.62 = 185.65/x
  3. Step 3: Cross multiply
    208.96x = 311.62 × 185.65
  4. Step 4: Simplify right side
    208.96x = 57,852.25
  5. Step 5: Solve for x
    x = 57,852.25/208.96
  6. Step 6: Final answer
    x = 276.86

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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.