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Finding the Fourth Proportional to 2,091.82, 3,137.20 and 859.57

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Solution

The fourth proportional to 2,091.82, 3,137.20 and 859.57 is: 1,289.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.82 : 3,137.20 = 859.57 : x
  2. Step 2: Convert to fraction form
    2,091.82/3,137.20 = 859.57/x
  3. Step 3: Cross multiply
    2,091.82x = 3,137.20 × 859.57
  4. Step 4: Simplify right side
    2,091.82x = 2,696,633.01
  5. Step 5: Solve for x
    x = 2,696,633.01/2,091.82
  6. Step 6: Final answer
    x = 1,289.13

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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.