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Finding the Fourth Proportional to 8,919.79, 13,380.32 and 3,076.31

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Solution

The fourth proportional to 8,919.79, 13,380.32 and 3,076.31 is: 4,614.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.79 : 13,380.32 = 3,076.31 : x
  2. Step 2: Convert to fraction form
    8,919.79/13,380.32 = 3,076.31/x
  3. Step 3: Cross multiply
    8,919.79x = 13,380.32 × 3,076.31
  4. Step 4: Simplify right side
    8,919.79x = 41,162,053.36
  5. Step 5: Solve for x
    x = 41,162,053.36/8,919.79
  6. Step 6: Final answer
    x = 4,614.69

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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.