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Finding the Fourth Proportional to 20,687.88, 30,992.70 and 12,229.08

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Solution

The fourth proportional to 20,687.88, 30,992.70 and 12,229.08 is: 18,320.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.88 : 30,992.70 = 12,229.08 : x
  2. Step 2: Convert to fraction form
    20,687.88/30,992.70 = 12,229.08/x
  3. Step 3: Cross multiply
    20,687.88x = 30,992.70 × 12,229.08
  4. Step 4: Simplify right side
    20,687.88x = 379,012,207.72
  5. Step 5: Solve for x
    x = 379,012,207.72/20,687.88
  6. Step 6: Final answer
    x = 18,320.50

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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.