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Finding the Fourth Proportional to 12,640, 18,960 and 3,406

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Solution

The fourth proportional to 12,640, 18,960 and 3,406 is: 5,109

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640 : 18,960 = 3,406 : x
  2. Step 2: Convert to fraction form
    12,640/18,960 = 3,406/x
  3. Step 3: Cross multiply
    12,640x = 18,960 × 3,406
  4. Step 4: Simplify right side
    12,640x = 64,577,760
  5. Step 5: Solve for x
    x = 64,577,760/12,640
  6. Step 6: Final answer
    x = 5,109

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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.