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Finding the Fourth Proportional to 69,679.88, 104,537.18 and 20,431.88

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Solution

The fourth proportional to 69,679.88, 104,537.18 and 20,431.88 is: 30,652.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,679.88 : 104,537.18 = 20,431.88 : x
  2. Step 2: Convert to fraction form
    69,679.88/104,537.18 = 20,431.88/x
  3. Step 3: Cross multiply
    69,679.88x = 104,537.18 × 20,431.88
  4. Step 4: Simplify right side
    69,679.88x = 2,135,890,492.45
  5. Step 5: Solve for x
    x = 2,135,890,492.45/69,679.88
  6. Step 6: Final answer
    x = 30,652.90

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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.