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Finding the Fourth Proportional to 68,879.20, 103,121.70 and 42,405.70

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Solution

The fourth proportional to 68,879.20, 103,121.70 and 42,405.70 is: 63,487.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,879.20 : 103,121.70 = 42,405.70 : x
  2. Step 2: Convert to fraction form
    68,879.20/103,121.70 = 42,405.70/x
  3. Step 3: Cross multiply
    68,879.20x = 103,121.70 × 42,405.70
  4. Step 4: Simplify right side
    68,879.20x = 4,372,947,873.69
  5. Step 5: Solve for x
    x = 4,372,947,873.69/68,879.20
  6. Step 6: Final answer
    x = 63,487.20

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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.