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Finding the Fourth Proportional to 7,992.78, 11,989.20 and 2,149.20

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Solution

The fourth proportional to 7,992.78, 11,989.20 and 2,149.20 is: 3,223.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,992.78 : 11,989.20 = 2,149.20 : x
  2. Step 2: Convert to fraction form
    7,992.78/11,989.20 = 2,149.20/x
  3. Step 3: Cross multiply
    7,992.78x = 11,989.20 × 2,149.20
  4. Step 4: Simplify right side
    7,992.78x = 25,767,188.64
  5. Step 5: Solve for x
    x = 25,767,188.64/7,992.78
  6. Step 6: Final answer
    x = 3,223.81

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1.5x scale

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.