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Finding the Fourth Proportional to 19,940.78, 29,911.22 and 18,722.90

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Solution

The fourth proportional to 19,940.78, 29,911.22 and 18,722.90 is: 28,084.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,940.78 : 29,911.22 = 18,722.90 : x
  2. Step 2: Convert to fraction form
    19,940.78/29,911.22 = 18,722.90/x
  3. Step 3: Cross multiply
    19,940.78x = 29,911.22 × 18,722.90
  4. Step 4: Simplify right side
    19,940.78x = 560,024,537.77
  5. Step 5: Solve for x
    x = 560,024,537.77/19,940.78
  6. Step 6: Final answer
    x = 28,084.39

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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.