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Finding the Fourth Proportional to 129,894.21, 179,234.79 and 78,880.41

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Solution

The fourth proportional to 129,894.21, 179,234.79 and 78,880.41 is: 108,843.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,894.21 : 179,234.79 = 78,880.41 : x
  2. Step 2: Convert to fraction form
    129,894.21/179,234.79 = 78,880.41/x
  3. Step 3: Cross multiply
    129,894.21x = 179,234.79 × 78,880.41
  4. Step 4: Simplify right side
    129,894.21x = 14,138,113,721.46
  5. Step 5: Solve for x
    x = 14,138,113,721.46/129,894.21
  6. Step 6: Final answer
    x = 108,843.29

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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.