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Finding the Fourth Proportional to 12,645.92, 18,961.20 and 6,486.56

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Solution

The fourth proportional to 12,645.92, 18,961.20 and 6,486.56 is: 9,725.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,645.92 : 18,961.20 = 6,486.56 : x
  2. Step 2: Convert to fraction form
    12,645.92/18,961.20 = 6,486.56/x
  3. Step 3: Cross multiply
    12,645.92x = 18,961.20 × 6,486.56
  4. Step 4: Simplify right side
    12,645.92x = 122,992,961.47
  5. Step 5: Solve for x
    x = 122,992,961.47/12,645.92
  6. Step 6: Final answer
    x = 9,725.90

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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.