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Finding the Fourth Proportional to 80,520.66, 120,786.93 and 21,355.02

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Solution

The fourth proportional to 80,520.66, 120,786.93 and 21,355.02 is: 32,034.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,520.66 : 120,786.93 = 21,355.02 : x
  2. Step 2: Convert to fraction form
    80,520.66/120,786.93 = 21,355.02/x
  3. Step 3: Cross multiply
    80,520.66x = 120,786.93 × 21,355.02
  4. Step 4: Simplify right side
    80,520.66x = 2,579,407,305.89
  5. Step 5: Solve for x
    x = 2,579,407,305.89/80,520.66
  6. Step 6: Final answer
    x = 32,034.11

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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.