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Finding the Fourth Proportional to 80,379.74, 120,559.34 and 21,219.86

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Solution

The fourth proportional to 80,379.74, 120,559.34 and 21,219.86 is: 31,827.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,379.74 : 120,559.34 = 21,219.86 : x
  2. Step 2: Convert to fraction form
    80,379.74/120,559.34 = 21,219.86/x
  3. Step 3: Cross multiply
    80,379.74x = 120,559.34 × 21,219.86
  4. Step 4: Simplify right side
    80,379.74x = 2,558,252,316.49
  5. Step 5: Solve for x
    x = 2,558,252,316.49/80,379.74
  6. Step 6: Final answer
    x = 31,827.08

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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.