Home / 8,128.81-12,191.96-2,581.43

Finding the Fourth Proportional to 8,128.81, 12,191.96 and 2,581.43

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Solution

The fourth proportional to 8,128.81, 12,191.96 and 2,581.43 is: 3,871.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.81 : 12,191.96 = 2,581.43 : x
  2. Step 2: Convert to fraction form
    8,128.81/12,191.96 = 2,581.43/x
  3. Step 3: Cross multiply
    8,128.81x = 12,191.96 × 2,581.43
  4. Step 4: Simplify right side
    8,128.81x = 31,472,691.30
  5. Step 5: Solve for x
    x = 31,472,691.30/8,128.81
  6. Step 6: Final answer
    x = 3,871.75

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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.