Home / 11,987.92-17,979.40-3,220.75

Finding the Fourth Proportional to 11,987.92, 17,979.40 and 3,220.75

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Solution

The fourth proportional to 11,987.92, 17,979.40 and 3,220.75 is: 4,830.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,987.92 : 17,979.40 = 3,220.75 : x
  2. Step 2: Convert to fraction form
    11,987.92/17,979.40 = 3,220.75/x
  3. Step 3: Cross multiply
    11,987.92x = 17,979.40 × 3,220.75
  4. Step 4: Simplify right side
    11,987.92x = 57,907,152.55
  5. Step 5: Solve for x
    x = 57,907,152.55/11,987.92
  6. Step 6: Final answer
    x = 4,830.46

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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.