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Finding the Fourth Proportional to 8,060.40, 12,083.40 and 3,128.40

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Solution

The fourth proportional to 8,060.40, 12,083.40 and 3,128.40 is: 4,689.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,060.40 : 12,083.40 = 3,128.40 : x
  2. Step 2: Convert to fraction form
    8,060.40/12,083.40 = 3,128.40/x
  3. Step 3: Cross multiply
    8,060.40x = 12,083.40 × 3,128.40
  4. Step 4: Simplify right side
    8,060.40x = 37,801,708.56
  5. Step 5: Solve for x
    x = 37,801,708.56/8,060.40
  6. Step 6: Final answer
    x = 4,689.81

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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.