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Finding the Fourth Proportional to 1,391.75, 2,083.47 and 842.27

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Solution

The fourth proportional to 1,391.75, 2,083.47 and 842.27 is: 1,260.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.75 : 2,083.47 = 842.27 : x
  2. Step 2: Convert to fraction form
    1,391.75/2,083.47 = 842.27/x
  3. Step 3: Cross multiply
    1,391.75x = 2,083.47 × 842.27
  4. Step 4: Simplify right side
    1,391.75x = 1,754,844.28
  5. Step 5: Solve for x
    x = 1,754,844.28/1,391.75
  6. Step 6: Final answer
    x = 1,260.89

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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.