Home / 3,121.23-4,305.38-1,861.49

Finding the Fourth Proportional to 3,121.23, 4,305.38 and 1,861.49

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Solution

The fourth proportional to 3,121.23, 4,305.38 and 1,861.49 is: 2,567.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.23 : 4,305.38 = 1,861.49 : x
  2. Step 2: Convert to fraction form
    3,121.23/4,305.38 = 1,861.49/x
  3. Step 3: Cross multiply
    3,121.23x = 4,305.38 × 1,861.49
  4. Step 4: Simplify right side
    3,121.23x = 8,014,390.98
  5. Step 5: Solve for x
    x = 8,014,390.98/3,121.23
  6. Step 6: Final answer
    x = 2,567.70

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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.