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Finding the Fourth Proportional to 138,418.40, 207,627.60 and 68,434.40

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Solution

The fourth proportional to 138,418.40, 207,627.60 and 68,434.40 is: 102,651.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,418.40 : 207,627.60 = 68,434.40 : x
  2. Step 2: Convert to fraction form
    138,418.40/207,627.60 = 68,434.40/x
  3. Step 3: Cross multiply
    138,418.40x = 207,627.60 × 68,434.40
  4. Step 4: Simplify right side
    138,418.40x = 14,208,870,229.44
  5. Step 5: Solve for x
    x = 14,208,870,229.44/138,418.40
  6. Step 6: Final answer
    x = 102,651.60

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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.