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Finding the Fourth Proportional to 80,341.80, 120,512.70 and 21,183.45

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Solution

The fourth proportional to 80,341.80, 120,512.70 and 21,183.45 is: 31,775.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,341.80 : 120,512.70 = 21,183.45 : x
  2. Step 2: Convert to fraction form
    80,341.80/120,512.70 = 21,183.45/x
  3. Step 3: Cross multiply
    80,341.80x = 120,512.70 × 21,183.45
  4. Step 4: Simplify right side
    80,341.80x = 2,552,874,754.82
  5. Step 5: Solve for x
    x = 2,552,874,754.82/80,341.80
  6. Step 6: Final answer
    x = 31,775.18

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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.