Home / 5,424.12-8,128.80-2,821.68

Finding the Fourth Proportional to 5,424.12, 8,128.80 and 2,821.68

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Solution

The fourth proportional to 5,424.12, 8,128.80 and 2,821.68 is: 4,228.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,424.12 : 8,128.80 = 2,821.68 : x
  2. Step 2: Convert to fraction form
    5,424.12/8,128.80 = 2,821.68/x
  3. Step 3: Cross multiply
    5,424.12x = 8,128.80 × 2,821.68
  4. Step 4: Simplify right side
    5,424.12x = 22,936,872.38
  5. Step 5: Solve for x
    x = 22,936,872.38/5,424.12
  6. Step 6: Final answer
    x = 4,228.68

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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.