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Finding the Fourth Proportional to 120,691.60, 181,231.80 and 91,142.80

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Solution

The fourth proportional to 120,691.60, 181,231.80 and 91,142.80 is: 136,861.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,691.60 : 181,231.80 = 91,142.80 : x
  2. Step 2: Convert to fraction form
    120,691.60/181,231.80 = 91,142.80/x
  3. Step 3: Cross multiply
    120,691.60x = 181,231.80 × 91,142.80
  4. Step 4: Simplify right side
    120,691.60x = 16,517,973,701.04
  5. Step 5: Solve for x
    x = 16,517,973,701.04/120,691.60
  6. Step 6: Final answer
    x = 136,861.01

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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.