Home / 2,791.21-4,186.90-1,403.78

Finding the Fourth Proportional to 2,791.21, 4,186.90 and 1,403.78

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Solution

The fourth proportional to 2,791.21, 4,186.90 and 1,403.78 is: 2,105.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,791.21 : 4,186.90 = 1,403.78 : x
  2. Step 2: Convert to fraction form
    2,791.21/4,186.90 = 1,403.78/x
  3. Step 3: Cross multiply
    2,791.21x = 4,186.90 × 1,403.78
  4. Step 4: Simplify right side
    2,791.21x = 5,877,504.57
  5. Step 5: Solve for x
    x = 5,877,504.57/2,791.21
  6. Step 6: Final answer
    x = 2,105.72

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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.