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Finding the Fourth Proportional to 138,790.56, 191,530.92 and 75,128.88

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Solution

The fourth proportional to 138,790.56, 191,530.92 and 75,128.88 is: 103,677.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,790.56 : 191,530.92 = 75,128.88 : x
  2. Step 2: Convert to fraction form
    138,790.56/191,530.92 = 75,128.88/x
  3. Step 3: Cross multiply
    138,790.56x = 191,530.92 × 75,128.88
  4. Step 4: Simplify right side
    138,790.56x = 14,389,503,504.97
  5. Step 5: Solve for x
    x = 14,389,503,504.97/138,790.56
  6. Step 6: Final answer
    x = 103,677.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.