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Finding the Fourth Proportional to 120,620.70, 181,125.45 and 81,351.90

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Solution

The fourth proportional to 120,620.70, 181,125.45 and 81,351.90 is: 122,158.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,620.70 : 181,125.45 = 81,351.90 : x
  2. Step 2: Convert to fraction form
    120,620.70/181,125.45 = 81,351.90/x
  3. Step 3: Cross multiply
    120,620.70x = 181,125.45 × 81,351.90
  4. Step 4: Simplify right side
    120,620.70x = 14,734,899,495.86
  5. Step 5: Solve for x
    x = 14,734,899,495.86/120,620.70
  6. Step 6: Final answer
    x = 122,158.96

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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.