Home / 2,821.20-4,231.80-2,165.10

Finding the Fourth Proportional to 2,821.20, 4,231.80 and 2,165.10

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Solution

The fourth proportional to 2,821.20, 4,231.80 and 2,165.10 is: 3,247.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,821.20 : 4,231.80 = 2,165.10 : x
  2. Step 2: Convert to fraction form
    2,821.20/4,231.80 = 2,165.10/x
  3. Step 3: Cross multiply
    2,821.20x = 4,231.80 × 2,165.10
  4. Step 4: Simplify right side
    2,821.20x = 9,162,270.18
  5. Step 5: Solve for x
    x = 9,162,270.18/2,821.20
  6. Step 6: Final answer
    x = 3,247.65

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Similar ratio
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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.