Home / 2,579.78-3,878.28-2,120.99

Finding the Fourth Proportional to 2,579.78, 3,878.28 and 2,120.99

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Solution

The fourth proportional to 2,579.78, 3,878.28 and 2,120.99 is: 3,188.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,579.78 : 3,878.28 = 2,120.99 : x
  2. Step 2: Convert to fraction form
    2,579.78/3,878.28 = 2,120.99/x
  3. Step 3: Cross multiply
    2,579.78x = 3,878.28 × 2,120.99
  4. Step 4: Simplify right side
    2,579.78x = 8,225,773.71
  5. Step 5: Solve for x
    x = 8,225,773.71/2,579.78
  6. Step 6: Final answer
    x = 3,188.55

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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.