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Finding the Fourth Proportional to 1,879.70, 2,819.01 and 725.18

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Solution

The fourth proportional to 1,879.70, 2,819.01 and 725.18 is: 1,087.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.70 : 2,819.01 = 725.18 : x
  2. Step 2: Convert to fraction form
    1,879.70/2,819.01 = 725.18/x
  3. Step 3: Cross multiply
    1,879.70x = 2,819.01 × 725.18
  4. Step 4: Simplify right side
    1,879.70x = 2,044,289.67
  5. Step 5: Solve for x
    x = 2,044,289.67/1,879.70
  6. Step 6: Final answer
    x = 1,087.56

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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.