Home / 3,841.20-5,761.80-1,378.80

Finding the Fourth Proportional to 3,841.20, 5,761.80 and 1,378.80

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Solution

The fourth proportional to 3,841.20, 5,761.80 and 1,378.80 is: 2,068.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,841.20 : 5,761.80 = 1,378.80 : x
  2. Step 2: Convert to fraction form
    3,841.20/5,761.80 = 1,378.80/x
  3. Step 3: Cross multiply
    3,841.20x = 5,761.80 × 1,378.80
  4. Step 4: Simplify right side
    3,841.20x = 7,944,369.84
  5. Step 5: Solve for x
    x = 7,944,369.84/3,841.20
  6. Step 6: Final answer
    x = 2,068.20

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1.5x scale

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.