Home / 3,115.89-4,299.35-1,919.72

Finding the Fourth Proportional to 3,115.89, 4,299.35 and 1,919.72

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Solution

The fourth proportional to 3,115.89, 4,299.35 and 1,919.72 is: 2,648.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.89 : 4,299.35 = 1,919.72 : x
  2. Step 2: Convert to fraction form
    3,115.89/4,299.35 = 1,919.72/x
  3. Step 3: Cross multiply
    3,115.89x = 4,299.35 × 1,919.72
  4. Step 4: Simplify right side
    3,115.89x = 8,253,549.33
  5. Step 5: Solve for x
    x = 8,253,549.33/3,115.89
  6. Step 6: Final answer
    x = 2,648.86

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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.