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Finding the Fourth Proportional to 2,857.56, 4,287.90 and 1,990.20

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Solution

The fourth proportional to 2,857.56, 4,287.90 and 1,990.20 is: 2,986.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.56 : 4,287.90 = 1,990.20 : x
  2. Step 2: Convert to fraction form
    2,857.56/4,287.90 = 1,990.20/x
  3. Step 3: Cross multiply
    2,857.56x = 4,287.90 × 1,990.20
  4. Step 4: Simplify right side
    2,857.56x = 8,533,778.58
  5. Step 5: Solve for x
    x = 8,533,778.58/2,857.56
  6. Step 6: Final answer
    x = 2,986.39

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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.