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Finding the Fourth Proportional to 12,438.60, 18,660.12 and 4,119.12

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Solution

The fourth proportional to 12,438.60, 18,660.12 and 4,119.12 is: 6,179.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,438.60 : 18,660.12 = 4,119.12 : x
  2. Step 2: Convert to fraction form
    12,438.60/18,660.12 = 4,119.12/x
  3. Step 3: Cross multiply
    12,438.60x = 18,660.12 × 4,119.12
  4. Step 4: Simplify right side
    12,438.60x = 76,863,273.49
  5. Step 5: Solve for x
    x = 76,863,273.49/12,438.60
  6. Step 6: Final answer
    x = 6,179.42

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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.