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Finding the Fourth Proportional to 126,189.36, 189,410.40 and 90,692.40

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Solution

The fourth proportional to 126,189.36, 189,410.40 and 90,692.40 is: 136,129.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,189.36 : 189,410.40 = 90,692.40 : x
  2. Step 2: Convert to fraction form
    126,189.36/189,410.40 = 90,692.40/x
  3. Step 3: Cross multiply
    126,189.36x = 189,410.40 × 90,692.40
  4. Step 4: Simplify right side
    126,189.36x = 17,178,083,760.96
  5. Step 5: Solve for x
    x = 17,178,083,760.96/126,189.36
  6. Step 6: Final answer
    x = 136,129.42

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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.