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Finding the Fourth Proportional to 1,408.84, 2,112.96 and 996.80

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Solution

The fourth proportional to 1,408.84, 2,112.96 and 996.80 is: 1,494.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.84 : 2,112.96 = 996.80 : x
  2. Step 2: Convert to fraction form
    1,408.84/2,112.96 = 996.80/x
  3. Step 3: Cross multiply
    1,408.84x = 2,112.96 × 996.80
  4. Step 4: Simplify right side
    1,408.84x = 2,106,198.53
  5. Step 5: Solve for x
    x = 2,106,198.53/1,408.84
  6. Step 6: Final answer
    x = 1,494.99

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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.