Home / 1,279.40-1,761.75-1,137.54

Finding the Fourth Proportional to 1,279.40, 1,761.75 and 1,137.54

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Solution

The fourth proportional to 1,279.40, 1,761.75 and 1,137.54 is: 1,566.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.40 : 1,761.75 = 1,137.54 : x
  2. Step 2: Convert to fraction form
    1,279.40/1,761.75 = 1,137.54/x
  3. Step 3: Cross multiply
    1,279.40x = 1,761.75 × 1,137.54
  4. Step 4: Simplify right side
    1,279.40x = 2,004,067.70
  5. Step 5: Solve for x
    x = 2,004,067.70/1,279.40
  6. Step 6: Final answer
    x = 1,566.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.