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Finding the Fourth Proportional to 126,305.80, 189,021.30 and 86,939.80

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Solution

The fourth proportional to 126,305.80, 189,021.30 and 86,939.80 is: 130,108.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,305.80 : 189,021.30 = 86,939.80 : x
  2. Step 2: Convert to fraction form
    126,305.80/189,021.30 = 86,939.80/x
  3. Step 3: Cross multiply
    126,305.80x = 189,021.30 × 86,939.80
  4. Step 4: Simplify right side
    126,305.80x = 16,433,474,017.74
  5. Step 5: Solve for x
    x = 16,433,474,017.74/126,305.80
  6. Step 6: Final answer
    x = 130,108.63

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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.