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Finding the Fourth Proportional to 12,138.66, 18,209.81 and 3,816.82

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Solution

The fourth proportional to 12,138.66, 18,209.81 and 3,816.82 is: 5,725.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.66 : 18,209.81 = 3,816.82 : x
  2. Step 2: Convert to fraction form
    12,138.66/18,209.81 = 3,816.82/x
  3. Step 3: Cross multiply
    12,138.66x = 18,209.81 × 3,816.82
  4. Step 4: Simplify right side
    12,138.66x = 69,503,599.31
  5. Step 5: Solve for x
    x = 69,503,599.31/12,138.66
  6. Step 6: Final answer
    x = 5,725.80

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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.