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Finding the Fourth Proportional to 18,138.80, 27,208.20 and 12,609.20

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Solution

The fourth proportional to 18,138.80, 27,208.20 and 12,609.20 is: 18,913.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,138.80 : 27,208.20 = 12,609.20 : x
  2. Step 2: Convert to fraction form
    18,138.80/27,208.20 = 12,609.20/x
  3. Step 3: Cross multiply
    18,138.80x = 27,208.20 × 12,609.20
  4. Step 4: Simplify right side
    18,138.80x = 343,073,635.44
  5. Step 5: Solve for x
    x = 343,073,635.44/18,138.80
  6. Step 6: Final answer
    x = 18,913.80

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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.