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Finding the Fourth Proportional to 12,279.92, 18,419.90 and 3,960.54

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Solution

The fourth proportional to 12,279.92, 18,419.90 and 3,960.54 is: 5,940.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.92 : 18,419.90 = 3,960.54 : x
  2. Step 2: Convert to fraction form
    12,279.92/18,419.90 = 3,960.54/x
  3. Step 3: Cross multiply
    12,279.92x = 18,419.90 × 3,960.54
  4. Step 4: Simplify right side
    12,279.92x = 72,952,730.94
  5. Step 5: Solve for x
    x = 72,952,730.94/12,279.92
  6. Step 6: Final answer
    x = 5,940.82

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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.