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Finding the Fourth Proportional to 8,631.45, 12,947.18 and 8,121.15

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Solution

The fourth proportional to 8,631.45, 12,947.18 and 8,121.15 is: 12,181.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,631.45 : 12,947.18 = 8,121.15 : x
  2. Step 2: Convert to fraction form
    8,631.45/12,947.18 = 8,121.15/x
  3. Step 3: Cross multiply
    8,631.45x = 12,947.18 × 8,121.15
  4. Step 4: Simplify right side
    8,631.45x = 105,145,950.25
  5. Step 5: Solve for x
    x = 105,145,950.25/8,631.45
  6. Step 6: Final answer
    x = 12,181.73

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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.