Home / 2,811.08-4,219.50-1,990.28

Finding the Fourth Proportional to 2,811.08, 4,219.50 and 1,990.28

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Solution

The fourth proportional to 2,811.08, 4,219.50 and 1,990.28 is: 2,987.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.08 : 4,219.50 = 1,990.28 : x
  2. Step 2: Convert to fraction form
    2,811.08/4,219.50 = 1,990.28/x
  3. Step 3: Cross multiply
    2,811.08x = 4,219.50 × 1,990.28
  4. Step 4: Simplify right side
    2,811.08x = 8,397,986.46
  5. Step 5: Solve for x
    x = 8,397,986.46/2,811.08
  6. Step 6: Final answer
    x = 2,987.46

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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.