Home / 2,987.80-4,121.78-2,104.20

Finding the Fourth Proportional to 2,987.80, 4,121.78 and 2,104.20

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Solution

The fourth proportional to 2,987.80, 4,121.78 and 2,104.20 is: 2,902.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.80 : 4,121.78 = 2,104.20 : x
  2. Step 2: Convert to fraction form
    2,987.80/4,121.78 = 2,104.20/x
  3. Step 3: Cross multiply
    2,987.80x = 4,121.78 × 2,104.20
  4. Step 4: Simplify right side
    2,987.80x = 8,673,049.48
  5. Step 5: Solve for x
    x = 8,673,049.48/2,987.80
  6. Step 6: Final answer
    x = 2,902.82

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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.