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Finding the Fourth Proportional to 18,520.65, 27,789.82 and 8,658.50

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Solution

The fourth proportional to 18,520.65, 27,789.82 and 8,658.50 is: 12,991.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,520.65 : 27,789.82 = 8,658.50 : x
  2. Step 2: Convert to fraction form
    18,520.65/27,789.82 = 8,658.50/x
  3. Step 3: Cross multiply
    18,520.65x = 27,789.82 × 8,658.50
  4. Step 4: Simplify right side
    18,520.65x = 240,617,995.87
  5. Step 5: Solve for x
    x = 240,617,995.87/18,520.65
  6. Step 6: Final answer
    x = 12,991.88

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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.