Home / 8,721.12-13,081.44-2,147.28

Finding the Fourth Proportional to 8,721.12, 13,081.44 and 2,147.28

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Solution

The fourth proportional to 8,721.12, 13,081.44 and 2,147.28 is: 3,220.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721.12 : 13,081.44 = 2,147.28 : x
  2. Step 2: Convert to fraction form
    8,721.12/13,081.44 = 2,147.28/x
  3. Step 3: Cross multiply
    8,721.12x = 13,081.44 × 2,147.28
  4. Step 4: Simplify right side
    8,721.12x = 28,089,514.48
  5. Step 5: Solve for x
    x = 28,089,514.48/8,721.12
  6. Step 6: Final answer
    x = 3,220.86

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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.