Home / 5,418.80-8,139.12-3,231.80

Finding the Fourth Proportional to 5,418.80, 8,139.12 and 3,231.80

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Solution

The fourth proportional to 5,418.80, 8,139.12 and 3,231.80 is: 4,854.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.80 : 8,139.12 = 3,231.80 : x
  2. Step 2: Convert to fraction form
    5,418.80/8,139.12 = 3,231.80/x
  3. Step 3: Cross multiply
    5,418.80x = 8,139.12 × 3,231.80
  4. Step 4: Simplify right side
    5,418.80x = 26,303,967.32
  5. Step 5: Solve for x
    x = 26,303,967.32/5,418.80
  6. Step 6: Final answer
    x = 4,854.21

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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.