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Finding the Fourth Proportional to 1,879.80, 2,819.78 and 581.28

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Solution

The fourth proportional to 1,879.80, 2,819.78 and 581.28 is: 871.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.80 : 2,819.78 = 581.28 : x
  2. Step 2: Convert to fraction form
    1,879.80/2,819.78 = 581.28/x
  3. Step 3: Cross multiply
    1,879.80x = 2,819.78 × 581.28
  4. Step 4: Simplify right side
    1,879.80x = 1,639,081.72
  5. Step 5: Solve for x
    x = 1,639,081.72/1,879.80
  6. Step 6: Final answer
    x = 871.94

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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.