Home / 2,788.40-4,182.60-1,328.78

Finding the Fourth Proportional to 2,788.40, 4,182.60 and 1,328.78

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Solution

The fourth proportional to 2,788.40, 4,182.60 and 1,328.78 is: 1,993.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,788.40 : 4,182.60 = 1,328.78 : x
  2. Step 2: Convert to fraction form
    2,788.40/4,182.60 = 1,328.78/x
  3. Step 3: Cross multiply
    2,788.40x = 4,182.60 × 1,328.78
  4. Step 4: Simplify right side
    2,788.40x = 5,557,755.23
  5. Step 5: Solve for x
    x = 5,557,755.23/2,788.40
  6. Step 6: Final answer
    x = 1,993.17

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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.