Home / 2,990.46-4,128.39-2,107.02

Finding the Fourth Proportional to 2,990.46, 4,128.39 and 2,107.02

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Solution

The fourth proportional to 2,990.46, 4,128.39 and 2,107.02 is: 2,908.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.46 : 4,128.39 = 2,107.02 : x
  2. Step 2: Convert to fraction form
    2,990.46/4,128.39 = 2,107.02/x
  3. Step 3: Cross multiply
    2,990.46x = 4,128.39 × 2,107.02
  4. Step 4: Simplify right side
    2,990.46x = 8,698,600.30
  5. Step 5: Solve for x
    x = 8,698,600.30/2,990.46
  6. Step 6: Final answer
    x = 2,908.78

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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.