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Finding the Fourth Proportional to 2,991.66, 4,487.67 and 911.81

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Solution

The fourth proportional to 2,991.66, 4,487.67 and 911.81 is: 1,367.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.66 : 4,487.67 = 911.81 : x
  2. Step 2: Convert to fraction form
    2,991.66/4,487.67 = 911.81/x
  3. Step 3: Cross multiply
    2,991.66x = 4,487.67 × 911.81
  4. Step 4: Simplify right side
    2,991.66x = 4,091,879.94
  5. Step 5: Solve for x
    x = 4,091,879.94/2,991.66
  6. Step 6: Final answer
    x = 1,367.76

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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.