Home / 3,131.21-4,320.56-1,872.78

Finding the Fourth Proportional to 3,131.21, 4,320.56 and 1,872.78

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Solution

The fourth proportional to 3,131.21, 4,320.56 and 1,872.78 is: 2,584.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.21 : 4,320.56 = 1,872.78 : x
  2. Step 2: Convert to fraction form
    3,131.21/4,320.56 = 1,872.78/x
  3. Step 3: Cross multiply
    3,131.21x = 4,320.56 × 1,872.78
  4. Step 4: Simplify right side
    3,131.21x = 8,091,448.99
  5. Step 5: Solve for x
    x = 8,091,448.99/3,131.21
  6. Step 6: Final answer
    x = 2,584.13

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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.