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Finding the Fourth Proportional to 68,190.21, 102,291.11 and 20,815.94

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Solution

The fourth proportional to 68,190.21, 102,291.11 and 20,815.94 is: 31,225.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,190.21 : 102,291.11 = 20,815.94 : x
  2. Step 2: Convert to fraction form
    68,190.21/102,291.11 = 20,815.94/x
  3. Step 3: Cross multiply
    68,190.21x = 102,291.11 × 20,815.94
  4. Step 4: Simplify right side
    68,190.21x = 2,129,284,992.76
  5. Step 5: Solve for x
    x = 2,129,284,992.76/68,190.21
  6. Step 6: Final answer
    x = 31,225.67

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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.