Home / 2,789.78-4,186.68-1,328.90

Finding the Fourth Proportional to 2,789.78, 4,186.68 and 1,328.90

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Solution

The fourth proportional to 2,789.78, 4,186.68 and 1,328.90 is: 1,994.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,789.78 : 4,186.68 = 1,328.90 : x
  2. Step 2: Convert to fraction form
    2,789.78/4,186.68 = 1,328.90/x
  3. Step 3: Cross multiply
    2,789.78x = 4,186.68 × 1,328.90
  4. Step 4: Simplify right side
    2,789.78x = 5,563,679.05
  5. Step 5: Solve for x
    x = 5,563,679.05/2,789.78
  6. Step 6: Final answer
    x = 1,994.31

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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.