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Finding the Fourth Proportional to 7,919.43, 11,879.64 and 2,654.21

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Solution

The fourth proportional to 7,919.43, 11,879.64 and 2,654.21 is: 3,981.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,919.43 : 11,879.64 = 2,654.21 : x
  2. Step 2: Convert to fraction form
    7,919.43/11,879.64 = 2,654.21/x
  3. Step 3: Cross multiply
    7,919.43x = 11,879.64 × 2,654.21
  4. Step 4: Simplify right side
    7,919.43x = 31,530,999.89
  5. Step 5: Solve for x
    x = 31,530,999.89/7,919.43
  6. Step 6: Final answer
    x = 3,981.47

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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.