Home / 13,983.84-20,979.38-4,122.78

Finding the Fourth Proportional to 13,983.84, 20,979.38 and 4,122.78

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Solution

The fourth proportional to 13,983.84, 20,979.38 and 4,122.78 is: 6,185.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,983.84 : 20,979.38 = 4,122.78 : x
  2. Step 2: Convert to fraction form
    13,983.84/20,979.38 = 4,122.78/x
  3. Step 3: Cross multiply
    13,983.84x = 20,979.38 × 4,122.78
  4. Step 4: Simplify right side
    13,983.84x = 86,493,368.28
  5. Step 5: Solve for x
    x = 86,493,368.28/13,983.84
  6. Step 6: Final answer
    x = 6,185.24

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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.