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Finding the Fourth Proportional to 80,688.80, 120,745.20 and 51,120.80

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Solution

The fourth proportional to 80,688.80, 120,745.20 and 51,120.80 is: 76,498.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,688.80 : 120,745.20 = 51,120.80 : x
  2. Step 2: Convert to fraction form
    80,688.80/120,745.20 = 51,120.80/x
  3. Step 3: Cross multiply
    80,688.80x = 120,745.20 × 51,120.80
  4. Step 4: Simplify right side
    80,688.80x = 6,172,591,220.16
  5. Step 5: Solve for x
    x = 6,172,591,220.16/80,688.80
  6. Step 6: Final answer
    x = 76,498.74

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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.