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Finding the Fourth Proportional to 126,645.88, 189,780.83 and 70,408.63

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Solution

The fourth proportional to 126,645.88, 189,780.83 and 70,408.63 is: 105,508.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,645.88 : 189,780.83 = 70,408.63 : x
  2. Step 2: Convert to fraction form
    126,645.88/189,780.83 = 70,408.63/x
  3. Step 3: Cross multiply
    126,645.88x = 189,780.83 × 70,408.63
  4. Step 4: Simplify right side
    126,645.88x = 13,362,207,414.07
  5. Step 5: Solve for x
    x = 13,362,207,414.07/126,645.88
  6. Step 6: Final answer
    x = 105,508.43

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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.