Home / 12,640.38-18,960.49-3,280.39

Finding the Fourth Proportional to 12,640.38, 18,960.49 and 3,280.39

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Solution

The fourth proportional to 12,640.38, 18,960.49 and 3,280.39 is: 4,920.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.38 : 18,960.49 = 3,280.39 : x
  2. Step 2: Convert to fraction form
    12,640.38/18,960.49 = 3,280.39/x
  3. Step 3: Cross multiply
    12,640.38x = 18,960.49 × 3,280.39
  4. Step 4: Simplify right side
    12,640.38x = 62,197,801.79
  5. Step 5: Solve for x
    x = 62,197,801.79/12,640.38
  6. Step 6: Final answer
    x = 4,920.56

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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.