Home / 2,181.62-3,272.57-720.78

Finding the Fourth Proportional to 2,181.62, 3,272.57 and 720.78

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Solution

The fourth proportional to 2,181.62, 3,272.57 and 720.78 is: 1,081.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,181.62 : 3,272.57 = 720.78 : x
  2. Step 2: Convert to fraction form
    2,181.62/3,272.57 = 720.78/x
  3. Step 3: Cross multiply
    2,181.62x = 3,272.57 × 720.78
  4. Step 4: Simplify right side
    2,181.62x = 2,358,799.40
  5. Step 5: Solve for x
    x = 2,358,799.40/2,181.62
  6. Step 6: Final answer
    x = 1,081.22

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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.