Home / 13,781.72-20,669.48-3,920.78

Finding the Fourth Proportional to 13,781.72, 20,669.48 and 3,920.78

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Solution

The fourth proportional to 13,781.72, 20,669.48 and 3,920.78 is: 5,880.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.72 : 20,669.48 = 3,920.78 : x
  2. Step 2: Convert to fraction form
    13,781.72/20,669.48 = 3,920.78/x
  3. Step 3: Cross multiply
    13,781.72x = 20,669.48 × 3,920.78
  4. Step 4: Simplify right side
    13,781.72x = 81,040,483.79
  5. Step 5: Solve for x
    x = 81,040,483.79/13,781.72
  6. Step 6: Final answer
    x = 5,880.29

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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.