Home / 5,428.81-8,128.23-2,790.62

Finding the Fourth Proportional to 5,428.81, 8,128.23 and 2,790.62

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Solution

The fourth proportional to 5,428.81, 8,128.23 and 2,790.62 is: 4,178.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428.81 : 8,128.23 = 2,790.62 : x
  2. Step 2: Convert to fraction form
    5,428.81/8,128.23 = 2,790.62/x
  3. Step 3: Cross multiply
    5,428.81x = 8,128.23 × 2,790.62
  4. Step 4: Simplify right side
    5,428.81x = 22,682,796.27
  5. Step 5: Solve for x
    x = 22,682,796.27/5,428.81
  6. Step 6: Final answer
    x = 4,178.23

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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.