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Finding the Fourth Proportional to 80,649.48, 120,976.92 and 28,059.40

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Solution

The fourth proportional to 80,649.48, 120,976.92 and 28,059.40 is: 42,090.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,649.48 : 120,976.92 = 28,059.40 : x
  2. Step 2: Convert to fraction form
    80,649.48/120,976.92 = 28,059.40/x
  3. Step 3: Cross multiply
    80,649.48x = 120,976.92 × 28,059.40
  4. Step 4: Simplify right side
    80,649.48x = 3,394,539,789.05
  5. Step 5: Solve for x
    x = 3,394,539,789.05/80,649.48
  6. Step 6: Final answer
    x = 42,090.04

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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.