Home / 13,988.25-20,979.15-3,992.81

Finding the Fourth Proportional to 13,988.25, 20,979.15 and 3,992.81

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Solution

The fourth proportional to 13,988.25, 20,979.15 and 3,992.81 is: 5,988.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,988.25 : 20,979.15 = 3,992.81 : x
  2. Step 2: Convert to fraction form
    13,988.25/20,979.15 = 3,992.81/x
  3. Step 3: Cross multiply
    13,988.25x = 20,979.15 × 3,992.81
  4. Step 4: Simplify right side
    13,988.25x = 83,765,655.02
  5. Step 5: Solve for x
    x = 83,765,655.02/13,988.25
  6. Step 6: Final answer
    x = 5,988.29

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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.