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Finding the Fourth Proportional to 422,665.26, 634,095.09 and 138,364.98

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Solution

The fourth proportional to 422,665.26, 634,095.09 and 138,364.98 is: 207,579.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,665.26 : 634,095.09 = 138,364.98 : x
  2. Step 2: Convert to fraction form
    422,665.26/634,095.09 = 138,364.98/x
  3. Step 3: Cross multiply
    422,665.26x = 634,095.09 × 138,364.98
  4. Step 4: Simplify right side
    422,665.26x = 87,736,555,757.44
  5. Step 5: Solve for x
    x = 87,736,555,757.44/422,665.26
  6. Step 6: Final answer
    x = 207,579.29

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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.