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Finding the Fourth Proportional to 18,121.61, 27,160.09 and 8,638.91

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Solution

The fourth proportional to 18,121.61, 27,160.09 and 8,638.91 is: 12,947.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,121.61 : 27,160.09 = 8,638.91 : x
  2. Step 2: Convert to fraction form
    18,121.61/27,160.09 = 8,638.91/x
  3. Step 3: Cross multiply
    18,121.61x = 27,160.09 × 8,638.91
  4. Step 4: Simplify right side
    18,121.61x = 234,633,573.10
  5. Step 5: Solve for x
    x = 234,633,573.10/18,121.61
  6. Step 6: Final answer
    x = 12,947.72

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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.