Home / 2,105.20-3,157.80-1,817.20

Finding the Fourth Proportional to 2,105.20, 3,157.80 and 1,817.20

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Solution

The fourth proportional to 2,105.20, 3,157.80 and 1,817.20 is: 2,725.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.20 : 3,157.80 = 1,817.20 : x
  2. Step 2: Convert to fraction form
    2,105.20/3,157.80 = 1,817.20/x
  3. Step 3: Cross multiply
    2,105.20x = 3,157.80 × 1,817.20
  4. Step 4: Simplify right side
    2,105.20x = 5,738,354.16
  5. Step 5: Solve for x
    x = 5,738,354.16/2,105.20
  6. Step 6: Final answer
    x = 2,725.80

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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.