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Finding the Fourth Proportional to 122,379, 168,978.60 and 79,378.92

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Solution

The fourth proportional to 122,379, 168,978.60 and 79,378.92 is: 109,604.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,379 : 168,978.60 = 79,378.92 : x
  2. Step 2: Convert to fraction form
    122,379/168,978.60 = 79,378.92/x
  3. Step 3: Cross multiply
    122,379x = 168,978.60 × 79,378.92
  4. Step 4: Simplify right side
    122,379x = 13,413,338,771.11
  5. Step 5: Solve for x
    x = 13,413,338,771.11/122,379
  6. Step 6: Final answer
    x = 109,604.91

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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.