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Finding the Fourth Proportional to 139,678.14, 192,755.43 and 79,260.60

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Solution

The fourth proportional to 139,678.14, 192,755.43 and 79,260.60 is: 109,379.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,678.14 : 192,755.43 = 79,260.60 : x
  2. Step 2: Convert to fraction form
    139,678.14/192,755.43 = 79,260.60/x
  3. Step 3: Cross multiply
    139,678.14x = 192,755.43 × 79,260.60
  4. Step 4: Simplify right side
    139,678.14x = 15,277,911,035.06
  5. Step 5: Solve for x
    x = 15,277,911,035.06/139,678.14
  6. Step 6: Final answer
    x = 109,379.40

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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.