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Finding the Fourth Proportional to 70,121.70, 105,183.36 and 40,521.60

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Solution

The fourth proportional to 70,121.70, 105,183.36 and 40,521.60 is: 60,782.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,121.70 : 105,183.36 = 40,521.60 : x
  2. Step 2: Convert to fraction form
    70,121.70/105,183.36 = 40,521.60/x
  3. Step 3: Cross multiply
    70,121.70x = 105,183.36 × 40,521.60
  4. Step 4: Simplify right side
    70,121.70x = 4,262,198,040.58
  5. Step 5: Solve for x
    x = 4,262,198,040.58/70,121.70
  6. Step 6: Final answer
    x = 60,782.87

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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.