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Finding the Fourth Proportional to 20,361.78, 30,545.97 and 7,211.28

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Solution

The fourth proportional to 20,361.78, 30,545.97 and 7,211.28 is: 10,818.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,361.78 : 30,545.97 = 7,211.28 : x
  2. Step 2: Convert to fraction form
    20,361.78/30,545.97 = 7,211.28/x
  3. Step 3: Cross multiply
    20,361.78x = 30,545.97 × 7,211.28
  4. Step 4: Simplify right side
    20,361.78x = 220,275,542.54
  5. Step 5: Solve for x
    x = 220,275,542.54/20,361.78
  6. Step 6: Final answer
    x = 10,818.09

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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.