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Finding the Fourth Proportional to 129,593.28, 178,834.16 and 78,611.84

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Solution

The fourth proportional to 129,593.28, 178,834.16 and 78,611.84 is: 108,481.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,593.28 : 178,834.16 = 78,611.84 : x
  2. Step 2: Convert to fraction form
    129,593.28/178,834.16 = 78,611.84/x
  3. Step 3: Cross multiply
    129,593.28x = 178,834.16 × 78,611.84
  4. Step 4: Simplify right side
    129,593.28x = 14,058,482,372.45
  5. Step 5: Solve for x
    x = 14,058,482,372.45/129,593.28
  6. Step 6: Final answer
    x = 108,481.57

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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.