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Finding the Fourth Proportional to 81,161.20, 121,684.20 and 36,809.20

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Solution

The fourth proportional to 81,161.20, 121,684.20 and 36,809.20 is: 55,187.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,161.20 : 121,684.20 = 36,809.20 : x
  2. Step 2: Convert to fraction form
    81,161.20/121,684.20 = 36,809.20/x
  3. Step 3: Cross multiply
    81,161.20x = 121,684.20 × 36,809.20
  4. Step 4: Simplify right side
    81,161.20x = 4,479,098,054.64
  5. Step 5: Solve for x
    x = 4,479,098,054.64/81,161.20
  6. Step 6: Final answer
    x = 55,187.68

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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.