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Finding the Fourth Proportional to 120,699.20, 181,135.20 and 68,052.80

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Solution

The fourth proportional to 120,699.20, 181,135.20 and 68,052.80 is: 102,127.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,699.20 : 181,135.20 = 68,052.80 : x
  2. Step 2: Convert to fraction form
    120,699.20/181,135.20 = 68,052.80/x
  3. Step 3: Cross multiply
    120,699.20x = 181,135.20 × 68,052.80
  4. Step 4: Simplify right side
    120,699.20x = 12,326,757,538.56
  5. Step 5: Solve for x
    x = 12,326,757,538.56/120,699.20
  6. Step 6: Final answer
    x = 102,127.91

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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.