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Finding the Fourth Proportional to 13,920.96, 20,881.12 and 3,391.02

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Solution

The fourth proportional to 13,920.96, 20,881.12 and 3,391.02 is: 5,086.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.96 : 20,881.12 = 3,391.02 : x
  2. Step 2: Convert to fraction form
    13,920.96/20,881.12 = 3,391.02/x
  3. Step 3: Cross multiply
    13,920.96x = 20,881.12 × 3,391.02
  4. Step 4: Simplify right side
    13,920.96x = 70,808,295.54
  5. Step 5: Solve for x
    x = 70,808,295.54/13,920.96
  6. Step 6: Final answer
    x = 5,086.45

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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.