Home / 1,279.68-1,778.21-1,266.32

Finding the Fourth Proportional to 1,279.68, 1,778.21 and 1,266.32

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Solution

The fourth proportional to 1,279.68, 1,778.21 and 1,266.32 is: 1,759.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.68 : 1,778.21 = 1,266.32 : x
  2. Step 2: Convert to fraction form
    1,279.68/1,778.21 = 1,266.32/x
  3. Step 3: Cross multiply
    1,279.68x = 1,778.21 × 1,266.32
  4. Step 4: Simplify right side
    1,279.68x = 2,251,767.66
  5. Step 5: Solve for x
    x = 2,251,767.66/1,279.68
  6. Step 6: Final answer
    x = 1,759.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.