Home / 129,450.78-178,635.42-72,865.80

Finding the Fourth Proportional to 129,450.78, 178,635.42 and 72,865.80

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Solution

The fourth proportional to 129,450.78, 178,635.42 and 72,865.80 is: 100,551.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,450.78 : 178,635.42 = 72,865.80 : x
  2. Step 2: Convert to fraction form
    129,450.78/178,635.42 = 72,865.80/x
  3. Step 3: Cross multiply
    129,450.78x = 178,635.42 × 72,865.80
  4. Step 4: Simplify right side
    129,450.78x = 13,016,412,786.64
  5. Step 5: Solve for x
    x = 13,016,412,786.64/129,450.78
  6. Step 6: Final answer
    x = 100,551.06

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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.