Home / 3,891.20-5,368.20-2,840.96

Finding the Fourth Proportional to 3,891.20, 5,368.20 and 2,840.96

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Solution

The fourth proportional to 3,891.20, 5,368.20 and 2,840.96 is: 3,919.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.20 : 5,368.20 = 2,840.96 : x
  2. Step 2: Convert to fraction form
    3,891.20/5,368.20 = 2,840.96/x
  3. Step 3: Cross multiply
    3,891.20x = 5,368.20 × 2,840.96
  4. Step 4: Simplify right side
    3,891.20x = 15,250,841.47
  5. Step 5: Solve for x
    x = 15,250,841.47/3,891.20
  6. Step 6: Final answer
    x = 3,919.32

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1.5x scale

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.