Home / 3,078.21-4,247.97-1,680.96

Finding the Fourth Proportional to 3,078.21, 4,247.97 and 1,680.96

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Solution

The fourth proportional to 3,078.21, 4,247.97 and 1,680.96 is: 2,319.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.21 : 4,247.97 = 1,680.96 : x
  2. Step 2: Convert to fraction form
    3,078.21/4,247.97 = 1,680.96/x
  3. Step 3: Cross multiply
    3,078.21x = 4,247.97 × 1,680.96
  4. Step 4: Simplify right side
    3,078.21x = 7,140,667.65
  5. Step 5: Solve for x
    x = 7,140,667.65/3,078.21
  6. Step 6: Final answer
    x = 2,319.75

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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.