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Finding the Fourth Proportional to 18,111.70, 27,131.10 and 12,206.80

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Solution

The fourth proportional to 18,111.70, 27,131.10 and 12,206.80 is: 18,285.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,111.70 : 27,131.10 = 12,206.80 : x
  2. Step 2: Convert to fraction form
    18,111.70/27,131.10 = 12,206.80/x
  3. Step 3: Cross multiply
    18,111.70x = 27,131.10 × 12,206.80
  4. Step 4: Simplify right side
    18,111.70x = 331,183,911.48
  5. Step 5: Solve for x
    x = 331,183,911.48/18,111.70
  6. Step 6: Final answer
    x = 18,285.63

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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.