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Finding the Fourth Proportional to 129,886.39, 179,193.82 and 78,879.77

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Solution

The fourth proportional to 129,886.39, 179,193.82 and 78,879.77 is: 108,824.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,886.39 : 179,193.82 = 78,879.77 : x
  2. Step 2: Convert to fraction form
    129,886.39/179,193.82 = 78,879.77/x
  3. Step 3: Cross multiply
    129,886.39x = 179,193.82 × 78,879.77
  4. Step 4: Simplify right side
    129,886.39x = 14,134,768,041.69
  5. Step 5: Solve for x
    x = 14,134,768,041.69/129,886.39
  6. Step 6: Final answer
    x = 108,824.09

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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.