Home / 13,918.90-20,878.30-3,388.80

Finding the Fourth Proportional to 13,918.90, 20,878.30 and 3,388.80

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Solution

The fourth proportional to 13,918.90, 20,878.30 and 3,388.80 is: 5,083.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,918.90 : 20,878.30 = 3,388.80 : x
  2. Step 2: Convert to fraction form
    13,918.90/20,878.30 = 3,388.80/x
  3. Step 3: Cross multiply
    13,918.90x = 20,878.30 × 3,388.80
  4. Step 4: Simplify right side
    13,918.90x = 70,752,383.04
  5. Step 5: Solve for x
    x = 70,752,383.04/13,918.90
  6. Step 6: Final answer
    x = 5,083.19

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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.