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Finding the Fourth Proportional to 2,991.74, 4,488.28 and 911.78

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Solution

The fourth proportional to 2,991.74, 4,488.28 and 911.78 is: 1,367.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.74 : 4,488.28 = 911.78 : x
  2. Step 2: Convert to fraction form
    2,991.74/4,488.28 = 911.78/x
  3. Step 3: Cross multiply
    2,991.74x = 4,488.28 × 911.78
  4. Step 4: Simplify right side
    2,991.74x = 4,092,323.94
  5. Step 5: Solve for x
    x = 4,092,323.94/2,991.74
  6. Step 6: Final answer
    x = 1,367.87

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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.