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Finding the Fourth Proportional to 2,819.84, 3,891 and 1,640

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Solution

The fourth proportional to 2,819.84, 3,891 and 1,640 is: 2,262.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,819.84 : 3,891 = 1,640 : x
  2. Step 2: Convert to fraction form
    2,819.84/3,891 = 1,640/x
  3. Step 3: Cross multiply
    2,819.84x = 3,891 × 1,640
  4. Step 4: Simplify right side
    2,819.84x = 6,381,240
  5. Step 5: Solve for x
    x = 6,381,240/2,819.84
  6. Step 6: Final answer
    x = 2,262.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.