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Finding the Fourth Proportional to 126,139.68, 189,292.68 and 67,018.32

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Solution

The fourth proportional to 126,139.68, 189,292.68 and 67,018.32 is: 100,571.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,139.68 : 189,292.68 = 67,018.32 : x
  2. Step 2: Convert to fraction form
    126,139.68/189,292.68 = 67,018.32/x
  3. Step 3: Cross multiply
    126,139.68x = 189,292.68 × 67,018.32
  4. Step 4: Simplify right side
    126,139.68x = 12,686,077,401.90
  5. Step 5: Solve for x
    x = 12,686,077,401.90/126,139.68
  6. Step 6: Final answer
    x = 100,571.66

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1.5x scale

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.