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Finding the Fourth Proportional to 121,687.88, 167,975.46 and 91,560.78

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Solution

The fourth proportional to 121,687.88, 167,975.46 and 91,560.78 is: 126,388.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,687.88 : 167,975.46 = 91,560.78 : x
  2. Step 2: Convert to fraction form
    121,687.88/167,975.46 = 91,560.78/x
  3. Step 3: Cross multiply
    121,687.88x = 167,975.46 × 91,560.78
  4. Step 4: Simplify right side
    121,687.88x = 15,379,964,138.46
  5. Step 5: Solve for x
    x = 15,379,964,138.46/121,687.88
  6. Step 6: Final answer
    x = 126,388.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.