Home / 2,115.78-2,919.74-1,171.64

Finding the Fourth Proportional to 2,115.78, 2,919.74 and 1,171.64

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Solution

The fourth proportional to 2,115.78, 2,919.74 and 1,171.64 is: 1,616.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.78 : 2,919.74 = 1,171.64 : x
  2. Step 2: Convert to fraction form
    2,115.78/2,919.74 = 1,171.64/x
  3. Step 3: Cross multiply
    2,115.78x = 2,919.74 × 1,171.64
  4. Step 4: Simplify right side
    2,115.78x = 3,420,863.72
  5. Step 5: Solve for x
    x = 3,420,863.72/2,115.78
  6. Step 6: Final answer
    x = 1,616.83

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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.