Home / 3,078.19-4,247.90-1,680.94

Finding the Fourth Proportional to 3,078.19, 4,247.90 and 1,680.94

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Solution

The fourth proportional to 3,078.19, 4,247.90 and 1,680.94 is: 2,319.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.19 : 4,247.90 = 1,680.94 : x
  2. Step 2: Convert to fraction form
    3,078.19/4,247.90 = 1,680.94/x
  3. Step 3: Cross multiply
    3,078.19x = 4,247.90 × 1,680.94
  4. Step 4: Simplify right side
    3,078.19x = 7,140,465.03
  5. Step 5: Solve for x
    x = 7,140,465.03/3,078.19
  6. Step 6: Final answer
    x = 2,319.70

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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.