Home / 13,986.24-20,976.16-3,990.80

Finding the Fourth Proportional to 13,986.24, 20,976.16 and 3,990.80

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Solution

The fourth proportional to 13,986.24, 20,976.16 and 3,990.80 is: 5,985.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.24 : 20,976.16 = 3,990.80 : x
  2. Step 2: Convert to fraction form
    13,986.24/20,976.16 = 3,990.80/x
  3. Step 3: Cross multiply
    13,986.24x = 20,976.16 × 3,990.80
  4. Step 4: Simplify right side
    13,986.24x = 83,711,659.33
  5. Step 5: Solve for x
    x = 83,711,659.33/13,986.24
  6. Step 6: Final answer
    x = 5,985.29

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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.