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Finding the Fourth Proportional to 139,448.43, 192,431.45 and 79,019.80

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Solution

The fourth proportional to 139,448.43, 192,431.45 and 79,019.80 is: 109,043.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,448.43 : 192,431.45 = 79,019.80 : x
  2. Step 2: Convert to fraction form
    139,448.43/192,431.45 = 79,019.80/x
  3. Step 3: Cross multiply
    139,448.43x = 192,431.45 × 79,019.80
  4. Step 4: Simplify right side
    139,448.43x = 15,205,893,730.55
  5. Step 5: Solve for x
    x = 15,205,893,730.55/139,448.43
  6. Step 6: Final answer
    x = 109,043.13

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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.