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Finding the Fourth Proportional to 139,067.88, 191,913.67 and 75,405.72

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Solution

The fourth proportional to 139,067.88, 191,913.67 and 75,405.72 is: 104,059.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,067.88 : 191,913.67 = 75,405.72 : x
  2. Step 2: Convert to fraction form
    139,067.88/191,913.67 = 75,405.72/x
  3. Step 3: Cross multiply
    139,067.88x = 191,913.67 × 75,405.72
  4. Step 4: Simplify right side
    139,067.88x = 14,471,388,464.19
  5. Step 5: Solve for x
    x = 14,471,388,464.19/139,067.88
  6. Step 6: Final answer
    x = 104,059.89

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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.