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Finding the Fourth Proportional to 120,700.60, 181,245.30 and 91,151.80

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Solution

The fourth proportional to 120,700.60, 181,245.30 and 91,151.80 is: 136,874.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,700.60 : 181,245.30 = 91,151.80 : x
  2. Step 2: Convert to fraction form
    120,700.60/181,245.30 = 91,151.80/x
  3. Step 3: Cross multiply
    120,700.60x = 181,245.30 × 91,151.80
  4. Step 4: Simplify right side
    120,700.60x = 16,520,835,336.54
  5. Step 5: Solve for x
    x = 16,520,835,336.54/120,700.60
  6. Step 6: Final answer
    x = 136,874.51

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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.