Home / 1,919.34-2,879.28-620.55

Finding the Fourth Proportional to 1,919.34, 2,879.28 and 620.55

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Solution

The fourth proportional to 1,919.34, 2,879.28 and 620.55 is: 930.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.34 : 2,879.28 = 620.55 : x
  2. Step 2: Convert to fraction form
    1,919.34/2,879.28 = 620.55/x
  3. Step 3: Cross multiply
    1,919.34x = 2,879.28 × 620.55
  4. Step 4: Simplify right side
    1,919.34x = 1,786,737.20
  5. Step 5: Solve for x
    x = 1,786,737.20/1,919.34
  6. Step 6: Final answer
    x = 930.91

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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.