Home / 2,836.80-4,255.20-1,378.80

Finding the Fourth Proportional to 2,836.80, 4,255.20 and 1,378.80

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Solution

The fourth proportional to 2,836.80, 4,255.20 and 1,378.80 is: 2,068.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,836.80 : 4,255.20 = 1,378.80 : x
  2. Step 2: Convert to fraction form
    2,836.80/4,255.20 = 1,378.80/x
  3. Step 3: Cross multiply
    2,836.80x = 4,255.20 × 1,378.80
  4. Step 4: Simplify right side
    2,836.80x = 5,867,069.76
  5. Step 5: Solve for x
    x = 5,867,069.76/2,836.80
  6. Step 6: Final answer
    x = 2,068.20

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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.