Home / 1,276.26-1,761.55-857.79

Finding the Fourth Proportional to 1,276.26, 1,761.55 and 857.79

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Solution

The fourth proportional to 1,276.26, 1,761.55 and 857.79 is: 1,183.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.26 : 1,761.55 = 857.79 : x
  2. Step 2: Convert to fraction form
    1,276.26/1,761.55 = 857.79/x
  3. Step 3: Cross multiply
    1,276.26x = 1,761.55 × 857.79
  4. Step 4: Simplify right side
    1,276.26x = 1,511,039.97
  5. Step 5: Solve for x
    x = 1,511,039.97/1,276.26
  6. Step 6: Final answer
    x = 1,183.96

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1.5x scale

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.