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Finding the Fourth Proportional to 18,638.86, 27,963.29 and 8,111.15

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Solution

The fourth proportional to 18,638.86, 27,963.29 and 8,111.15 is: 12,168.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,638.86 : 27,963.29 = 8,111.15 : x
  2. Step 2: Convert to fraction form
    18,638.86/27,963.29 = 8,111.15/x
  3. Step 3: Cross multiply
    18,638.86x = 27,963.29 × 8,111.15
  4. Step 4: Simplify right side
    18,638.86x = 226,814,259.31
  5. Step 5: Solve for x
    x = 226,814,259.31/18,638.86
  6. Step 6: Final answer
    x = 12,168.89

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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.