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Finding the Fourth Proportional to 139,705.41, 192,788.11 and 79,272.45

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Solution

The fourth proportional to 139,705.41, 192,788.11 and 79,272.45 is: 109,392.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,705.41 : 192,788.11 = 79,272.45 : x
  2. Step 2: Convert to fraction form
    139,705.41/192,788.11 = 79,272.45/x
  3. Step 3: Cross multiply
    139,705.41x = 192,788.11 × 79,272.45
  4. Step 4: Simplify right side
    139,705.41x = 15,282,785,810.57
  5. Step 5: Solve for x
    x = 15,282,785,810.57/139,705.41
  6. Step 6: Final answer
    x = 109,392.94

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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.