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Finding the Fourth Proportional to 445,173.78, 667,761.75 and 129,638.34

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Solution

The fourth proportional to 445,173.78, 667,761.75 and 129,638.34 is: 194,457.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,173.78 : 667,761.75 = 129,638.34 : x
  2. Step 2: Convert to fraction form
    445,173.78/667,761.75 = 129,638.34/x
  3. Step 3: Cross multiply
    445,173.78x = 667,761.75 × 129,638.34
  4. Step 4: Simplify right side
    445,173.78x = 86,567,524,785.50
  5. Step 5: Solve for x
    x = 86,567,524,785.50/445,173.78
  6. Step 6: Final answer
    x = 194,457.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.