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Finding the Fourth Proportional to 139,458.84, 192,410.46 and 79,019.88

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Solution

The fourth proportional to 139,458.84, 192,410.46 and 79,019.88 is: 109,023.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,458.84 : 192,410.46 = 79,019.88 : x
  2. Step 2: Convert to fraction form
    139,458.84/192,410.46 = 79,019.88/x
  3. Step 3: Cross multiply
    139,458.84x = 192,410.46 × 79,019.88
  4. Step 4: Simplify right side
    139,458.84x = 15,204,251,459.94
  5. Step 5: Solve for x
    x = 15,204,251,459.94/139,458.84
  6. Step 6: Final answer
    x = 109,023.22

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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.