Home / 129,717.12-178,984.32-79,380.48

Finding the Fourth Proportional to 129,717.12, 178,984.32 and 79,380.48

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Solution

The fourth proportional to 129,717.12, 178,984.32 and 79,380.48 is: 109,529.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,717.12 : 178,984.32 = 79,380.48 : x
  2. Step 2: Convert to fraction form
    129,717.12/178,984.32 = 79,380.48/x
  3. Step 3: Cross multiply
    129,717.12x = 178,984.32 × 79,380.48
  4. Step 4: Simplify right side
    129,717.12x = 14,207,861,234.07
  5. Step 5: Solve for x
    x = 14,207,861,234.07/129,717.12
  6. Step 6: Final answer
    x = 109,529.58

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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.