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Finding the Fourth Proportional to 36,379.85, 54,509.40 and 12,674.88

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Solution

The fourth proportional to 36,379.85, 54,509.40 and 12,674.88 is: 18,991.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    36,379.85 : 54,509.40 = 12,674.88 : x
  2. Step 2: Convert to fraction form
    36,379.85/54,509.40 = 12,674.88/x
  3. Step 3: Cross multiply
    36,379.85x = 54,509.40 × 12,674.88
  4. Step 4: Simplify right side
    36,379.85x = 690,900,103.87
  5. Step 5: Solve for x
    x = 690,900,103.87/36,379.85
  6. Step 6: Final answer
    x = 18,991.29

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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.