Home / 13,938.72-20,907.92-3,408.96

Finding the Fourth Proportional to 13,938.72, 20,907.92 and 3,408.96

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Solution

The fourth proportional to 13,938.72, 20,907.92 and 3,408.96 is: 5,113.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,938.72 : 20,907.92 = 3,408.96 : x
  2. Step 2: Convert to fraction form
    13,938.72/20,907.92 = 3,408.96/x
  3. Step 3: Cross multiply
    13,938.72x = 20,907.92 × 3,408.96
  4. Step 4: Simplify right side
    13,938.72x = 71,274,262.96
  5. Step 5: Solve for x
    x = 71,274,262.96/13,938.72
  6. Step 6: Final answer
    x = 5,113.40

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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.