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Finding the Fourth Proportional to 18,138.72, 27,217.80 and 16,816.80

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Solution

The fourth proportional to 18,138.72, 27,217.80 and 16,816.80 is: 25,234.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,138.72 : 27,217.80 = 16,816.80 : x
  2. Step 2: Convert to fraction form
    18,138.72/27,217.80 = 16,816.80/x
  3. Step 3: Cross multiply
    18,138.72x = 27,217.80 × 16,816.80
  4. Step 4: Simplify right side
    18,138.72x = 457,716,299.04
  5. Step 5: Solve for x
    x = 457,716,299.04/18,138.72
  6. Step 6: Final answer
    x = 25,234.21

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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.