Home / 1,408.20-1,942.62-911.27

Finding the Fourth Proportional to 1,408.20, 1,942.62 and 911.27

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Solution

The fourth proportional to 1,408.20, 1,942.62 and 911.27 is: 1,257.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.20 : 1,942.62 = 911.27 : x
  2. Step 2: Convert to fraction form
    1,408.20/1,942.62 = 911.27/x
  3. Step 3: Cross multiply
    1,408.20x = 1,942.62 × 911.27
  4. Step 4: Simplify right side
    1,408.20x = 1,770,241.61
  5. Step 5: Solve for x
    x = 1,770,241.61/1,408.20
  6. Step 6: Final answer
    x = 1,257.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.