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Finding the Fourth Proportional to 120,699.96, 166,704.19 and 79,491.17

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Solution

The fourth proportional to 120,699.96, 166,704.19 and 79,491.17 is: 109,788.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,699.96 : 166,704.19 = 79,491.17 : x
  2. Step 2: Convert to fraction form
    120,699.96/166,704.19 = 79,491.17/x
  3. Step 3: Cross multiply
    120,699.96x = 166,704.19 × 79,491.17
  4. Step 4: Simplify right side
    120,699.96x = 13,251,511,107.00
  5. Step 5: Solve for x
    x = 13,251,511,107.00/120,699.96
  6. Step 6: Final answer
    x = 109,788.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.