Home / 2,811.20-3,878.23-1,615.91

Finding the Fourth Proportional to 2,811.20, 3,878.23 and 1,615.91

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Solution

The fourth proportional to 2,811.20, 3,878.23 and 1,615.91 is: 2,229.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.20 : 3,878.23 = 1,615.91 : x
  2. Step 2: Convert to fraction form
    2,811.20/3,878.23 = 1,615.91/x
  3. Step 3: Cross multiply
    2,811.20x = 3,878.23 × 1,615.91
  4. Step 4: Simplify right side
    2,811.20x = 6,266,874.33
  5. Step 5: Solve for x
    x = 6,266,874.33/2,811.20
  6. Step 6: Final answer
    x = 2,229.25

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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.