Home / 1,928.40-2,661.60-1,219.79

Finding the Fourth Proportional to 1,928.40, 2,661.60 and 1,219.79

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Solution

The fourth proportional to 1,928.40, 2,661.60 and 1,219.79 is: 1,683.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,928.40 : 2,661.60 = 1,219.79 : x
  2. Step 2: Convert to fraction form
    1,928.40/2,661.60 = 1,219.79/x
  3. Step 3: Cross multiply
    1,928.40x = 2,661.60 × 1,219.79
  4. Step 4: Simplify right side
    1,928.40x = 3,246,593.06
  5. Step 5: Solve for x
    x = 3,246,593.06/1,928.40
  6. Step 6: Final answer
    x = 1,683.57

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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.