Home / 2,105.40-3,158.10-1,230.60

Finding the Fourth Proportional to 2,105.40, 3,158.10 and 1,230.60

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Solution

The fourth proportional to 2,105.40, 3,158.10 and 1,230.60 is: 1,845.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.40 : 3,158.10 = 1,230.60 : x
  2. Step 2: Convert to fraction form
    2,105.40/3,158.10 = 1,230.60/x
  3. Step 3: Cross multiply
    2,105.40x = 3,158.10 × 1,230.60
  4. Step 4: Simplify right side
    2,105.40x = 3,886,357.86
  5. Step 5: Solve for x
    x = 3,886,357.86/2,105.40
  6. Step 6: Final answer
    x = 1,845.90

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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.