Home / 2,279.28-3,145.36-1,284.64

Finding the Fourth Proportional to 2,279.28, 3,145.36 and 1,284.64

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Solution

The fourth proportional to 2,279.28, 3,145.36 and 1,284.64 is: 1,772.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.28 : 3,145.36 = 1,284.64 : x
  2. Step 2: Convert to fraction form
    2,279.28/3,145.36 = 1,284.64/x
  3. Step 3: Cross multiply
    2,279.28x = 3,145.36 × 1,284.64
  4. Step 4: Simplify right side
    2,279.28x = 4,040,655.27
  5. Step 5: Solve for x
    x = 4,040,655.27/2,279.28
  6. Step 6: Final answer
    x = 1,772.78

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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.