Home / 5,418.78-8,119.53-3,111.90

Finding the Fourth Proportional to 5,418.78, 8,119.53 and 3,111.90

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Solution

The fourth proportional to 5,418.78, 8,119.53 and 3,111.90 is: 4,662.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.78 : 8,119.53 = 3,111.90 : x
  2. Step 2: Convert to fraction form
    5,418.78/8,119.53 = 3,111.90/x
  3. Step 3: Cross multiply
    5,418.78x = 8,119.53 × 3,111.90
  4. Step 4: Simplify right side
    5,418.78x = 25,267,165.41
  5. Step 5: Solve for x
    x = 25,267,165.41/5,418.78
  6. Step 6: Final answer
    x = 4,662.89

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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.