Home / 3,121.45-4,308.02-2,003.65

Finding the Fourth Proportional to 3,121.45, 4,308.02 and 2,003.65

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Solution

The fourth proportional to 3,121.45, 4,308.02 and 2,003.65 is: 2,765.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.45 : 4,308.02 = 2,003.65 : x
  2. Step 2: Convert to fraction form
    3,121.45/4,308.02 = 2,003.65/x
  3. Step 3: Cross multiply
    3,121.45x = 4,308.02 × 2,003.65
  4. Step 4: Simplify right side
    3,121.45x = 8,631,764.27
  5. Step 5: Solve for x
    x = 8,631,764.27/3,121.45
  6. Step 6: Final answer
    x = 2,765.31

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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.