Home / 2,990.12-4,128.09-1,996.86

Finding the Fourth Proportional to 2,990.12, 4,128.09 and 1,996.86

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Solution

The fourth proportional to 2,990.12, 4,128.09 and 1,996.86 is: 2,756.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.12 : 4,128.09 = 1,996.86 : x
  2. Step 2: Convert to fraction form
    2,990.12/4,128.09 = 1,996.86/x
  3. Step 3: Cross multiply
    2,990.12x = 4,128.09 × 1,996.86
  4. Step 4: Simplify right side
    2,990.12x = 8,243,217.80
  5. Step 5: Solve for x
    x = 8,243,217.80/2,990.12
  6. Step 6: Final answer
    x = 2,756.82

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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.