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Finding the Fourth Proportional to 3,621.44, 4,978.37 and 3,115.44

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Solution

The fourth proportional to 3,621.44, 4,978.37 and 3,115.44 is: 4,282.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,621.44 : 4,978.37 = 3,115.44 : x
  2. Step 2: Convert to fraction form
    3,621.44/4,978.37 = 3,115.44/x
  3. Step 3: Cross multiply
    3,621.44x = 4,978.37 × 3,115.44
  4. Step 4: Simplify right side
    3,621.44x = 15,509,803.30
  5. Step 5: Solve for x
    x = 15,509,803.30/3,621.44
  6. Step 6: Final answer
    x = 4,282.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.