Home / 2,821.20-4,229.52-1,281.12

Finding the Fourth Proportional to 2,821.20, 4,229.52 and 1,281.12

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Solution

The fourth proportional to 2,821.20, 4,229.52 and 1,281.12 is: 1,920.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,821.20 : 4,229.52 = 1,281.12 : x
  2. Step 2: Convert to fraction form
    2,821.20/4,229.52 = 1,281.12/x
  3. Step 3: Cross multiply
    2,821.20x = 4,229.52 × 1,281.12
  4. Step 4: Simplify right side
    2,821.20x = 5,418,522.66
  5. Step 5: Solve for x
    x = 5,418,522.66/2,821.20
  6. Step 6: Final answer
    x = 1,920.64

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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.