Home / 1,408.16-2,112.80-945.60

Finding the Fourth Proportional to 1,408.16, 2,112.80 and 945.60

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Solution

The fourth proportional to 1,408.16, 2,112.80 and 945.60 is: 1,418.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.16 : 2,112.80 = 945.60 : x
  2. Step 2: Convert to fraction form
    1,408.16/2,112.80 = 945.60/x
  3. Step 3: Cross multiply
    1,408.16x = 2,112.80 × 945.60
  4. Step 4: Simplify right side
    1,408.16x = 1,997,863.68
  5. Step 5: Solve for x
    x = 1,997,863.68/1,408.16
  6. Step 6: Final answer
    x = 1,418.78

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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.