Home / 5,418.78-8,130.60-2,130.78

Finding the Fourth Proportional to 5,418.78, 8,130.60 and 2,130.78

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Solution

The fourth proportional to 5,418.78, 8,130.60 and 2,130.78 is: 3,197.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.78 : 8,130.60 = 2,130.78 : x
  2. Step 2: Convert to fraction form
    5,418.78/8,130.60 = 2,130.78/x
  3. Step 3: Cross multiply
    5,418.78x = 8,130.60 × 2,130.78
  4. Step 4: Simplify right side
    5,418.78x = 17,324,519.87
  5. Step 5: Solve for x
    x = 17,324,519.87/5,418.78
  6. Step 6: Final answer
    x = 3,197.13

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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.