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Finding the Fourth Proportional to 8,119.72, 12,149.66 and 7,187.88

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Solution

The fourth proportional to 8,119.72, 12,149.66 and 7,187.88 is: 10,755.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,119.72 : 12,149.66 = 7,187.88 : x
  2. Step 2: Convert to fraction form
    8,119.72/12,149.66 = 7,187.88/x
  3. Step 3: Cross multiply
    8,119.72x = 12,149.66 × 7,187.88
  4. Step 4: Simplify right side
    8,119.72x = 87,330,298.12
  5. Step 5: Solve for x
    x = 87,330,298.12/8,119.72
  6. Step 6: Final answer
    x = 10,755.33

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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.