Home / 8,138.20-12,207.30-7,187.80

Finding the Fourth Proportional to 8,138.20, 12,207.30 and 7,187.80

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Solution

The fourth proportional to 8,138.20, 12,207.30 and 7,187.80 is: 10,781.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.20 : 12,207.30 = 7,187.80 : x
  2. Step 2: Convert to fraction form
    8,138.20/12,207.30 = 7,187.80/x
  3. Step 3: Cross multiply
    8,138.20x = 12,207.30 × 7,187.80
  4. Step 4: Simplify right side
    8,138.20x = 87,743,630.94
  5. Step 5: Solve for x
    x = 87,743,630.94/8,138.20
  6. Step 6: Final answer
    x = 10,781.70

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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.