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Finding the Fourth Proportional to 12,640.50, 18,960.68 and 3,280.51

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Solution

The fourth proportional to 12,640.50, 18,960.68 and 3,280.51 is: 4,920.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.50 : 18,960.68 = 3,280.51 : x
  2. Step 2: Convert to fraction form
    12,640.50/18,960.68 = 3,280.51/x
  3. Step 3: Cross multiply
    12,640.50x = 18,960.68 × 3,280.51
  4. Step 4: Simplify right side
    12,640.50x = 62,200,732.25
  5. Step 5: Solve for x
    x = 62,200,732.25/12,640.50
  6. Step 6: Final answer
    x = 4,920.75

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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.