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Finding the Fourth Proportional to 68,906.40, 103,359.60 and 42,640.80

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Solution

The fourth proportional to 68,906.40, 103,359.60 and 42,640.80 is: 63,961.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,906.40 : 103,359.60 = 42,640.80 : x
  2. Step 2: Convert to fraction form
    68,906.40/103,359.60 = 42,640.80/x
  3. Step 3: Cross multiply
    68,906.40x = 103,359.60 × 42,640.80
  4. Step 4: Simplify right side
    68,906.40x = 4,407,336,031.68
  5. Step 5: Solve for x
    x = 4,407,336,031.68/68,906.40
  6. Step 6: Final answer
    x = 63,961.20

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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.