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Finding the Fourth Proportional to 126,039.70, 189,059.55 and 81,424.90

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Solution

The fourth proportional to 126,039.70, 189,059.55 and 81,424.90 is: 122,137.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,039.70 : 189,059.55 = 81,424.90 : x
  2. Step 2: Convert to fraction form
    126,039.70/189,059.55 = 81,424.90/x
  3. Step 3: Cross multiply
    126,039.70x = 189,059.55 × 81,424.90
  4. Step 4: Simplify right side
    126,039.70x = 15,394,154,952.80
  5. Step 5: Solve for x
    x = 15,394,154,952.80/126,039.70
  6. Step 6: Final answer
    x = 122,137.35

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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.