Home / 13,986.15-20,979.36-3,990.89

Finding the Fourth Proportional to 13,986.15, 20,979.36 and 3,990.89

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Solution

The fourth proportional to 13,986.15, 20,979.36 and 3,990.89 is: 5,986.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.15 : 20,979.36 = 3,990.89 : x
  2. Step 2: Convert to fraction form
    13,986.15/20,979.36 = 3,990.89/x
  3. Step 3: Cross multiply
    13,986.15x = 20,979.36 × 3,990.89
  4. Step 4: Simplify right side
    13,986.15x = 83,726,213.13
  5. Step 5: Solve for x
    x = 83,726,213.13/13,986.15
  6. Step 6: Final answer
    x = 5,986.37

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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.