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Finding the Fourth Proportional to 422,891.40, 634,365.90 and 134,680.20

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Solution

The fourth proportional to 422,891.40, 634,365.90 and 134,680.20 is: 202,029.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,891.40 : 634,365.90 = 134,680.20 : x
  2. Step 2: Convert to fraction form
    422,891.40/634,365.90 = 134,680.20/x
  3. Step 3: Cross multiply
    422,891.40x = 634,365.90 × 134,680.20
  4. Step 4: Simplify right side
    422,891.40x = 85,436,526,285.18
  5. Step 5: Solve for x
    x = 85,436,526,285.18/422,891.40
  6. Step 6: Final answer
    x = 202,029.47

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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.