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Finding the Fourth Proportional to 2,879.77, 3,974.09 and 1,620.90

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Solution

The fourth proportional to 2,879.77, 3,974.09 and 1,620.90 is: 2,236.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,879.77 : 3,974.09 = 1,620.90 : x
  2. Step 2: Convert to fraction form
    2,879.77/3,974.09 = 1,620.90/x
  3. Step 3: Cross multiply
    2,879.77x = 3,974.09 × 1,620.90
  4. Step 4: Simplify right side
    2,879.77x = 6,441,602.48
  5. Step 5: Solve for x
    x = 6,441,602.48/2,879.77
  6. Step 6: Final answer
    x = 2,236.85

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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.