Home / 3,078.20-4,247.88-1,680.95

Finding the Fourth Proportional to 3,078.20, 4,247.88 and 1,680.95

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Solution

The fourth proportional to 3,078.20, 4,247.88 and 1,680.95 is: 2,319.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.20 : 4,247.88 = 1,680.95 : x
  2. Step 2: Convert to fraction form
    3,078.20/4,247.88 = 1,680.95/x
  3. Step 3: Cross multiply
    3,078.20x = 4,247.88 × 1,680.95
  4. Step 4: Simplify right side
    3,078.20x = 7,140,452.65
  5. Step 5: Solve for x
    x = 7,140,452.65/3,078.20
  6. Step 6: Final answer
    x = 2,319.69

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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.