Home / 1,919.20-2,879.10-620.50

Finding the Fourth Proportional to 1,919.20, 2,879.10 and 620.50

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Solution

The fourth proportional to 1,919.20, 2,879.10 and 620.50 is: 930.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.20 : 2,879.10 = 620.50 : x
  2. Step 2: Convert to fraction form
    1,919.20/2,879.10 = 620.50/x
  3. Step 3: Cross multiply
    1,919.20x = 2,879.10 × 620.50
  4. Step 4: Simplify right side
    1,919.20x = 1,786,481.55
  5. Step 5: Solve for x
    x = 1,786,481.55/1,919.20
  6. Step 6: Final answer
    x = 930.85

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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.