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Finding the Fourth Proportional to 2,805.96, 4,215.90 and 1,819.40

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Solution

The fourth proportional to 2,805.96, 4,215.90 and 1,819.40 is: 2,733.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.96 : 4,215.90 = 1,819.40 : x
  2. Step 2: Convert to fraction form
    2,805.96/4,215.90 = 1,819.40/x
  3. Step 3: Cross multiply
    2,805.96x = 4,215.90 × 1,819.40
  4. Step 4: Simplify right side
    2,805.96x = 7,670,408.46
  5. Step 5: Solve for x
    x = 7,670,408.46/2,805.96
  6. Step 6: Final answer
    x = 2,733.61

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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.