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Finding the Fourth Proportional to 80,640.77, 120,973.91 and 21,481.20

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Solution

The fourth proportional to 80,640.77, 120,973.91 and 21,481.20 is: 32,225.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,640.77 : 120,973.91 = 21,481.20 : x
  2. Step 2: Convert to fraction form
    80,640.77/120,973.91 = 21,481.20/x
  3. Step 3: Cross multiply
    80,640.77x = 120,973.91 × 21,481.20
  4. Step 4: Simplify right side
    80,640.77x = 2,598,664,648.09
  5. Step 5: Solve for x
    x = 2,598,664,648.09/80,640.77
  6. Step 6: Final answer
    x = 32,225.20

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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.