Home / 5,815.20-8,722.38-2,115.60

Finding the Fourth Proportional to 5,815.20, 8,722.38 and 2,115.60

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Solution

The fourth proportional to 5,815.20, 8,722.38 and 2,115.60 is: 3,173.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,815.20 : 8,722.38 = 2,115.60 : x
  2. Step 2: Convert to fraction form
    5,815.20/8,722.38 = 2,115.60/x
  3. Step 3: Cross multiply
    5,815.20x = 8,722.38 × 2,115.60
  4. Step 4: Simplify right side
    5,815.20x = 18,453,067.13
  5. Step 5: Solve for x
    x = 18,453,067.13/5,815.20
  6. Step 6: Final answer
    x = 3,173.25

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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.