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Finding the Fourth Proportional to 2,091.78, 3,138.48 and 859.77

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Solution

The fourth proportional to 2,091.78, 3,138.48 and 859.77 is: 1,289.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.78 : 3,138.48 = 859.77 : x
  2. Step 2: Convert to fraction form
    2,091.78/3,138.48 = 859.77/x
  3. Step 3: Cross multiply
    2,091.78x = 3,138.48 × 859.77
  4. Step 4: Simplify right side
    2,091.78x = 2,698,370.95
  5. Step 5: Solve for x
    x = 2,698,370.95/2,091.78
  6. Step 6: Final answer
    x = 1,289.99

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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.