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Finding the Fourth Proportional to 138,893.30, 191,672.76 and 75,231.12

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Solution

The fourth proportional to 138,893.30, 191,672.76 and 75,231.12 is: 103,818.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,893.30 : 191,672.76 = 75,231.12 : x
  2. Step 2: Convert to fraction form
    138,893.30/191,672.76 = 75,231.12/x
  3. Step 3: Cross multiply
    138,893.30x = 191,672.76 × 75,231.12
  4. Step 4: Simplify right side
    138,893.30x = 14,419,755,449.93
  5. Step 5: Solve for x
    x = 14,419,755,449.93/138,893.30
  6. Step 6: Final answer
    x = 103,818.94

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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.