Home / 3,131.09-4,321.28-1,872.13

Finding the Fourth Proportional to 3,131.09, 4,321.28 and 1,872.13

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Solution

The fourth proportional to 3,131.09, 4,321.28 and 1,872.13 is: 2,583.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.09 : 4,321.28 = 1,872.13 : x
  2. Step 2: Convert to fraction form
    3,131.09/4,321.28 = 1,872.13/x
  3. Step 3: Cross multiply
    3,131.09x = 4,321.28 × 1,872.13
  4. Step 4: Simplify right side
    3,131.09x = 8,089,997.93
  5. Step 5: Solve for x
    x = 8,089,997.93/3,131.09
  6. Step 6: Final answer
    x = 2,583.76

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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.