Home / 5,215.12-7,821.75-2,581.78

Finding the Fourth Proportional to 5,215.12, 7,821.75 and 2,581.78

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Solution

The fourth proportional to 5,215.12, 7,821.75 and 2,581.78 is: 3,872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215.12 : 7,821.75 = 2,581.78 : x
  2. Step 2: Convert to fraction form
    5,215.12/7,821.75 = 2,581.78/x
  3. Step 3: Cross multiply
    5,215.12x = 7,821.75 × 2,581.78
  4. Step 4: Simplify right side
    5,215.12x = 20,194,037.72
  5. Step 5: Solve for x
    x = 20,194,037.72/5,215.12
  6. Step 6: Final answer
    x = 3,872.21

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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.