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Finding the Fourth Proportional to 18,140.85, 27,211.46 and 11,940.21

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Solution

The fourth proportional to 18,140.85, 27,211.46 and 11,940.21 is: 17,910.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,140.85 : 27,211.46 = 11,940.21 : x
  2. Step 2: Convert to fraction form
    18,140.85/27,211.46 = 11,940.21/x
  3. Step 3: Cross multiply
    18,140.85x = 27,211.46 × 11,940.21
  4. Step 4: Simplify right side
    18,140.85x = 324,910,487.11
  5. Step 5: Solve for x
    x = 324,910,487.11/18,140.85
  6. Step 6: Final answer
    x = 17,910.43

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Half scale
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Double scale
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Similar ratio
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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.