Home / 3,078.09-4,247.69-1,680.75

Finding the Fourth Proportional to 3,078.09, 4,247.69 and 1,680.75

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Solution

The fourth proportional to 3,078.09, 4,247.69 and 1,680.75 is: 2,319.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.09 : 4,247.69 = 1,680.75 : x
  2. Step 2: Convert to fraction form
    3,078.09/4,247.69 = 1,680.75/x
  3. Step 3: Cross multiply
    3,078.09x = 4,247.69 × 1,680.75
  4. Step 4: Simplify right side
    3,078.09x = 7,139,296.56
  5. Step 5: Solve for x
    x = 7,139,296.56/3,078.09
  6. Step 6: Final answer
    x = 2,319.39

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Half scale
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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.