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Finding the Fourth Proportional to 139,903.90, 193,067.40 and 76,241.70

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Solution

The fourth proportional to 139,903.90, 193,067.40 and 76,241.70 is: 105,213.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,903.90 : 193,067.40 = 76,241.70 : x
  2. Step 2: Convert to fraction form
    139,903.90/193,067.40 = 76,241.70/x
  3. Step 3: Cross multiply
    139,903.90x = 193,067.40 × 76,241.70
  4. Step 4: Simplify right side
    139,903.90x = 14,719,786,790.58
  5. Step 5: Solve for x
    x = 14,719,786,790.58/139,903.90
  6. Step 6: Final answer
    x = 105,213.56

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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.