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Finding the Fourth Proportional to 1,891.35, 2,834.60 and 851.31

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Solution

The fourth proportional to 1,891.35, 2,834.60 and 851.31 is: 1,275.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891.35 : 2,834.60 = 851.31 : x
  2. Step 2: Convert to fraction form
    1,891.35/2,834.60 = 851.31/x
  3. Step 3: Cross multiply
    1,891.35x = 2,834.60 × 851.31
  4. Step 4: Simplify right side
    1,891.35x = 2,413,119.07
  5. Step 5: Solve for x
    x = 2,413,119.07/1,891.35
  6. Step 6: Final answer
    x = 1,275.87

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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.