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Finding the Fourth Proportional to 8,129.80, 12,170.94 and 7,351.59

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Solution

The fourth proportional to 8,129.80, 12,170.94 and 7,351.59 is: 11,005.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,129.80 : 12,170.94 = 7,351.59 : x
  2. Step 2: Convert to fraction form
    8,129.80/12,170.94 = 7,351.59/x
  3. Step 3: Cross multiply
    8,129.80x = 12,170.94 × 7,351.59
  4. Step 4: Simplify right side
    8,129.80x = 89,475,760.79
  5. Step 5: Solve for x
    x = 89,475,760.79/8,129.80
  6. Step 6: Final answer
    x = 11,005.90

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1.5x scale

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.