Home / 2,181.38-3,272.30-720.80

Finding the Fourth Proportional to 2,181.38, 3,272.30 and 720.80

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Solution

The fourth proportional to 2,181.38, 3,272.30 and 720.80 is: 1,081.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,181.38 : 3,272.30 = 720.80 : x
  2. Step 2: Convert to fraction form
    2,181.38/3,272.30 = 720.80/x
  3. Step 3: Cross multiply
    2,181.38x = 3,272.30 × 720.80
  4. Step 4: Simplify right side
    2,181.38x = 2,358,668.85
  5. Step 5: Solve for x
    x = 2,358,668.85/2,181.38
  6. Step 6: Final answer
    x = 1,081.27

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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.