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Finding the Fourth Proportional to 8,122.15, 11,207.49 and 4,939.15

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Solution

The fourth proportional to 8,122.15, 11,207.49 and 4,939.15 is: 6,815.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,122.15 : 11,207.49 = 4,939.15 : x
  2. Step 2: Convert to fraction form
    8,122.15/11,207.49 = 4,939.15/x
  3. Step 3: Cross multiply
    8,122.15x = 11,207.49 × 4,939.15
  4. Step 4: Simplify right side
    8,122.15x = 55,355,474.23
  5. Step 5: Solve for x
    x = 55,355,474.23/8,122.15
  6. Step 6: Final answer
    x = 6,815.37

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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.