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Finding the Fourth Proportional to 126,145.86, 189,218.78 and 86,583.03

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Solution

The fourth proportional to 126,145.86, 189,218.78 and 86,583.03 is: 129,874.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,145.86 : 189,218.78 = 86,583.03 : x
  2. Step 2: Convert to fraction form
    126,145.86/189,218.78 = 86,583.03/x
  3. Step 3: Cross multiply
    126,145.86x = 189,218.78 × 86,583.03
  4. Step 4: Simplify right side
    126,145.86x = 16,383,134,974.53
  5. Step 5: Solve for x
    x = 16,383,134,974.53/126,145.86
  6. Step 6: Final answer
    x = 129,874.54

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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.