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Finding the Fourth Proportional to 12,640.75, 18,961.06 and 3,280.76

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Solution

The fourth proportional to 12,640.75, 18,961.06 and 3,280.76 is: 4,921.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.75 : 18,961.06 = 3,280.76 : x
  2. Step 2: Convert to fraction form
    12,640.75/18,961.06 = 3,280.76/x
  3. Step 3: Cross multiply
    12,640.75x = 18,961.06 × 3,280.76
  4. Step 4: Simplify right side
    12,640.75x = 62,206,687.21
  5. Step 5: Solve for x
    x = 62,206,687.21/12,640.75
  6. Step 6: Final answer
    x = 4,921.12

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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.