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Finding the Fourth Proportional to 2,091.97, 3,137.91 and 859.09

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Solution

The fourth proportional to 2,091.97, 3,137.91 and 859.09 is: 1,288.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.97 : 3,137.91 = 859.09 : x
  2. Step 2: Convert to fraction form
    2,091.97/3,137.91 = 859.09/x
  3. Step 3: Cross multiply
    2,091.97x = 3,137.91 × 859.09
  4. Step 4: Simplify right side
    2,091.97x = 2,695,747.10
  5. Step 5: Solve for x
    x = 2,695,747.10/2,091.97
  6. Step 6: Final answer
    x = 1,288.62

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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.