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Finding the Fourth Proportional to 3,540.80, 5,311.20 and 3,378.80

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Solution

The fourth proportional to 3,540.80, 5,311.20 and 3,378.80 is: 5,068.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,540.80 : 5,311.20 = 3,378.80 : x
  2. Step 2: Convert to fraction form
    3,540.80/5,311.20 = 3,378.80/x
  3. Step 3: Cross multiply
    3,540.80x = 5,311.20 × 3,378.80
  4. Step 4: Simplify right side
    3,540.80x = 17,945,482.56
  5. Step 5: Solve for x
    x = 17,945,482.56/3,540.80
  6. Step 6: Final answer
    x = 5,068.20

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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.