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Finding the Fourth Proportional to 80,739.65, 120,813.27 and 67,379.67

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Solution

The fourth proportional to 80,739.65, 120,813.27 and 67,379.67 is: 100,822.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,739.65 : 120,813.27 = 67,379.67 : x
  2. Step 2: Convert to fraction form
    80,739.65/120,813.27 = 67,379.67/x
  3. Step 3: Cross multiply
    80,739.65x = 120,813.27 × 67,379.67
  4. Step 4: Simplify right side
    80,739.65x = 8,140,357,323.26
  5. Step 5: Solve for x
    x = 8,140,357,323.26/80,739.65
  6. Step 6: Final answer
    x = 100,822.30

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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.