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Finding the Fourth Proportional to 139,080.39, 191,930.76 and 75,418.08

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Solution

The fourth proportional to 139,080.39, 191,930.76 and 75,418.08 is: 104,076.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,080.39 : 191,930.76 = 75,418.08 : x
  2. Step 2: Convert to fraction form
    139,080.39/191,930.76 = 75,418.08/x
  3. Step 3: Cross multiply
    139,080.39x = 191,930.76 × 75,418.08
  4. Step 4: Simplify right side
    139,080.39x = 14,475,049,412.14
  5. Step 5: Solve for x
    x = 14,475,049,412.14/139,080.39
  6. Step 6: Final answer
    x = 104,076.85

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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.