Home / 13,839.40-20,760.06-3,978.76

Finding the Fourth Proportional to 13,839.40, 20,760.06 and 3,978.76

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Solution

The fourth proportional to 13,839.40, 20,760.06 and 3,978.76 is: 5,968.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,839.40 : 20,760.06 = 3,978.76 : x
  2. Step 2: Convert to fraction form
    13,839.40/20,760.06 = 3,978.76/x
  3. Step 3: Cross multiply
    13,839.40x = 20,760.06 × 3,978.76
  4. Step 4: Simplify right side
    13,839.40x = 82,599,296.33
  5. Step 5: Solve for x
    x = 82,599,296.33/13,839.40
  6. Step 6: Final answer
    x = 5,968.42

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1.5x scale

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.