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Finding the Fourth Proportional to 2,091.44, 3,138.33 and 859.71

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Solution

The fourth proportional to 2,091.44, 3,138.33 and 859.71 is: 1,290.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.44 : 3,138.33 = 859.71 : x
  2. Step 2: Convert to fraction form
    2,091.44/3,138.33 = 859.71/x
  3. Step 3: Cross multiply
    2,091.44x = 3,138.33 × 859.71
  4. Step 4: Simplify right side
    2,091.44x = 2,698,053.68
  5. Step 5: Solve for x
    x = 2,698,053.68/2,091.44
  6. Step 6: Final answer
    x = 1,290.05

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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.