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Finding the Fourth Proportional to 8,137.89, 12,206.85 and 1,981.89

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Solution

The fourth proportional to 8,137.89, 12,206.85 and 1,981.89 is: 2,972.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,137.89 : 12,206.85 = 1,981.89 : x
  2. Step 2: Convert to fraction form
    8,137.89/12,206.85 = 1,981.89/x
  3. Step 3: Cross multiply
    8,137.89x = 12,206.85 × 1,981.89
  4. Step 4: Simplify right side
    8,137.89x = 24,192,633.95
  5. Step 5: Solve for x
    x = 24,192,633.95/8,137.89
  6. Step 6: Final answer
    x = 2,972.84

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Similar ratio
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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.