Home / 8,121.12-11,208.96-6,721.44

Finding the Fourth Proportional to 8,121.12, 11,208.96 and 6,721.44

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Solution

The fourth proportional to 8,121.12, 11,208.96 and 6,721.44 is: 9,277.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121.12 : 11,208.96 = 6,721.44 : x
  2. Step 2: Convert to fraction form
    8,121.12/11,208.96 = 6,721.44/x
  3. Step 3: Cross multiply
    8,121.12x = 11,208.96 × 6,721.44
  4. Step 4: Simplify right side
    8,121.12x = 75,340,352.10
  5. Step 5: Solve for x
    x = 75,340,352.10/8,121.12
  6. Step 6: Final answer
    x = 9,277.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.