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Finding the Fourth Proportional to 19,999.71, 29,982.56 and 12,213.99

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Solution

The fourth proportional to 19,999.71, 29,982.56 and 12,213.99 is: 18,310.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,999.71 : 29,982.56 = 12,213.99 : x
  2. Step 2: Convert to fraction form
    19,999.71/29,982.56 = 12,213.99/x
  3. Step 3: Cross multiply
    19,999.71x = 29,982.56 × 12,213.99
  4. Step 4: Simplify right side
    19,999.71x = 366,206,626.94
  5. Step 5: Solve for x
    x = 366,206,626.94/19,999.71
  6. Step 6: Final answer
    x = 18,310.60

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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.