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Finding the Fourth Proportional to 126,438.63, 189,685.26 and 67,265.70

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Solution

The fourth proportional to 126,438.63, 189,685.26 and 67,265.70 is: 100,913.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,438.63 : 189,685.26 = 67,265.70 : x
  2. Step 2: Convert to fraction form
    126,438.63/189,685.26 = 67,265.70/x
  3. Step 3: Cross multiply
    126,438.63x = 189,685.26 × 67,265.70
  4. Step 4: Simplify right side
    126,438.63x = 12,759,311,793.58
  5. Step 5: Solve for x
    x = 12,759,311,793.58/126,438.63
  6. Step 6: Final answer
    x = 100,913.08

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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.