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Finding the Fourth Proportional to 2,091.99, 3,137.15 and 859.35

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Solution

The fourth proportional to 2,091.99, 3,137.15 and 859.35 is: 1,288.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.99 : 3,137.15 = 859.35 : x
  2. Step 2: Convert to fraction form
    2,091.99/3,137.15 = 859.35/x
  3. Step 3: Cross multiply
    2,091.99x = 3,137.15 × 859.35
  4. Step 4: Simplify right side
    2,091.99x = 2,695,905.56
  5. Step 5: Solve for x
    x = 2,695,905.56/2,091.99
  6. Step 6: Final answer
    x = 1,288.68

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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.