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Finding the Fourth Proportional to 2,079.85, 3,121.02 and 830.22

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Solution

The fourth proportional to 2,079.85, 3,121.02 and 830.22 is: 1,245.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.85 : 3,121.02 = 830.22 : x
  2. Step 2: Convert to fraction form
    2,079.85/3,121.02 = 830.22/x
  3. Step 3: Cross multiply
    2,079.85x = 3,121.02 × 830.22
  4. Step 4: Simplify right side
    2,079.85x = 2,591,133.22
  5. Step 5: Solve for x
    x = 2,591,133.22/2,079.85
  6. Step 6: Final answer
    x = 1,245.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.