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Finding the Fourth Proportional to 18,722.74, 28,084.11 and 12,861.58

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Solution

The fourth proportional to 18,722.74, 28,084.11 and 12,861.58 is: 19,292.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722.74 : 28,084.11 = 12,861.58 : x
  2. Step 2: Convert to fraction form
    18,722.74/28,084.11 = 12,861.58/x
  3. Step 3: Cross multiply
    18,722.74x = 28,084.11 × 12,861.58
  4. Step 4: Simplify right side
    18,722.74x = 361,206,027.49
  5. Step 5: Solve for x
    x = 361,206,027.49/18,722.74
  6. Step 6: Final answer
    x = 19,292.37

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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.