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Finding the Fourth Proportional to 18,311.61, 27,448.89 and 7,213.98

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Solution

The fourth proportional to 18,311.61, 27,448.89 and 7,213.98 is: 10,813.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,311.61 : 27,448.89 = 7,213.98 : x
  2. Step 2: Convert to fraction form
    18,311.61/27,448.89 = 7,213.98/x
  3. Step 3: Cross multiply
    18,311.61x = 27,448.89 × 7,213.98
  4. Step 4: Simplify right side
    18,311.61x = 198,015,743.48
  5. Step 5: Solve for x
    x = 198,015,743.48/18,311.61
  6. Step 6: Final answer
    x = 10,813.67

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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.