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Finding the Fourth Proportional to 121,481.40, 182,142.90 and 109,039.80

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Solution

The fourth proportional to 121,481.40, 182,142.90 and 109,039.80 is: 163,488.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,481.40 : 182,142.90 = 109,039.80 : x
  2. Step 2: Convert to fraction form
    121,481.40/182,142.90 = 109,039.80/x
  3. Step 3: Cross multiply
    121,481.40x = 182,142.90 × 109,039.80
  4. Step 4: Simplify right side
    121,481.40x = 19,860,825,387.42
  5. Step 5: Solve for x
    x = 19,860,825,387.42/121,481.40
  6. Step 6: Final answer
    x = 163,488.61

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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.