Home / 2,121.91-3,180.60-805.05

Finding the Fourth Proportional to 2,121.91, 3,180.60 and 805.05

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Solution

The fourth proportional to 2,121.91, 3,180.60 and 805.05 is: 1,206.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.91 : 3,180.60 = 805.05 : x
  2. Step 2: Convert to fraction form
    2,121.91/3,180.60 = 805.05/x
  3. Step 3: Cross multiply
    2,121.91x = 3,180.60 × 805.05
  4. Step 4: Simplify right side
    2,121.91x = 2,560,542.03
  5. Step 5: Solve for x
    x = 2,560,542.03/2,121.91
  6. Step 6: Final answer
    x = 1,206.72

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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.