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Finding the Fourth Proportional to 80,379.50, 120,643.68 and 40,965.98

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Solution

The fourth proportional to 80,379.50, 120,643.68 and 40,965.98 is: 61,486.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,379.50 : 120,643.68 = 40,965.98 : x
  2. Step 2: Convert to fraction form
    80,379.50/120,643.68 = 40,965.98/x
  3. Step 3: Cross multiply
    80,379.50x = 120,643.68 × 40,965.98
  4. Step 4: Simplify right side
    80,379.50x = 4,942,286,582.01
  5. Step 5: Solve for x
    x = 4,942,286,582.01/80,379.50
  6. Step 6: Final answer
    x = 61,486.90

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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.