Home / 3,143.12-4,340.84-2,880.64

Finding the Fourth Proportional to 3,143.12, 4,340.84 and 2,880.64

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Solution

The fourth proportional to 3,143.12, 4,340.84 and 2,880.64 is: 3,978.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,143.12 : 4,340.84 = 2,880.64 : x
  2. Step 2: Convert to fraction form
    3,143.12/4,340.84 = 2,880.64/x
  3. Step 3: Cross multiply
    3,143.12x = 4,340.84 × 2,880.64
  4. Step 4: Simplify right side
    3,143.12x = 12,504,397.34
  5. Step 5: Solve for x
    x = 12,504,397.34/3,143.12
  6. Step 6: Final answer
    x = 3,978.34

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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.