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Finding the Fourth Proportional to 12,438, 18,657.36 and 3,204

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Solution

The fourth proportional to 12,438, 18,657.36 and 3,204 is: 4,806.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,438 : 18,657.36 = 3,204 : x
  2. Step 2: Convert to fraction form
    12,438/18,657.36 = 3,204/x
  3. Step 3: Cross multiply
    12,438x = 18,657.36 × 3,204
  4. Step 4: Simplify right side
    12,438x = 59,778,181.44
  5. Step 5: Solve for x
    x = 59,778,181.44/12,438
  6. Step 6: Final answer
    x = 4,806.09

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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.