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Finding the Fourth Proportional to 126,390.87, 189,621.74 and 55,319.70

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Solution

The fourth proportional to 126,390.87, 189,621.74 and 55,319.70 is: 82,995.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,390.87 : 189,621.74 = 55,319.70 : x
  2. Step 2: Convert to fraction form
    126,390.87/189,621.74 = 55,319.70/x
  3. Step 3: Cross multiply
    126,390.87x = 189,621.74 × 55,319.70
  4. Step 4: Simplify right side
    126,390.87x = 10,489,817,493.68
  5. Step 5: Solve for x
    x = 10,489,817,493.68/126,390.87
  6. Step 6: Final answer
    x = 82,995.06

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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.