Home / 3,131.85-4,321.80-1,805.58

Finding the Fourth Proportional to 3,131.85, 4,321.80 and 1,805.58

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Solution

The fourth proportional to 3,131.85, 4,321.80 and 1,805.58 is: 2,491.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.85 : 4,321.80 = 1,805.58 : x
  2. Step 2: Convert to fraction form
    3,131.85/4,321.80 = 1,805.58/x
  3. Step 3: Cross multiply
    3,131.85x = 4,321.80 × 1,805.58
  4. Step 4: Simplify right side
    3,131.85x = 7,803,355.64
  5. Step 5: Solve for x
    x = 7,803,355.64/3,131.85
  6. Step 6: Final answer
    x = 2,491.61

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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.