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Finding the Fourth Proportional to 80,328.92, 120,494.60 and 21,170.60

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Solution

The fourth proportional to 80,328.92, 120,494.60 and 21,170.60 is: 31,756.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,328.92 : 120,494.60 = 21,170.60 : x
  2. Step 2: Convert to fraction form
    80,328.92/120,494.60 = 21,170.60/x
  3. Step 3: Cross multiply
    80,328.92x = 120,494.60 × 21,170.60
  4. Step 4: Simplify right side
    80,328.92x = 2,550,942,978.76
  5. Step 5: Solve for x
    x = 2,550,942,978.76/80,328.92
  6. Step 6: Final answer
    x = 31,756.22

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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.