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Finding the Fourth Proportional to 122,379.60, 168,885.24 and 71,390.64

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Solution

The fourth proportional to 122,379.60, 168,885.24 and 71,390.64 is: 98,519.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,379.60 : 168,885.24 = 71,390.64 : x
  2. Step 2: Convert to fraction form
    122,379.60/168,885.24 = 71,390.64/x
  3. Step 3: Cross multiply
    122,379.60x = 168,885.24 × 71,390.64
  4. Step 4: Simplify right side
    122,379.60x = 12,056,825,370.15
  5. Step 5: Solve for x
    x = 12,056,825,370.15/122,379.60
  6. Step 6: Final answer
    x = 98,519.90

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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.