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Finding the Fourth Proportional to 126,693.25, 189,661.26 and 76,621.88

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Solution

The fourth proportional to 126,693.25, 189,661.26 and 76,621.88 is: 114,703.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,693.25 : 189,661.26 = 76,621.88 : x
  2. Step 2: Convert to fraction form
    126,693.25/189,661.26 = 76,621.88/x
  3. Step 3: Cross multiply
    126,693.25x = 189,661.26 × 76,621.88
  4. Step 4: Simplify right side
    126,693.25x = 14,532,203,065.85
  5. Step 5: Solve for x
    x = 14,532,203,065.85/126,693.25
  6. Step 6: Final answer
    x = 114,703.85

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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.