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Finding the Fourth Proportional to 20,611.76, 30,920.74 and 7,467.21

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Solution

The fourth proportional to 20,611.76, 30,920.74 and 7,467.21 is: 11,201.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.76 : 30,920.74 = 7,467.21 : x
  2. Step 2: Convert to fraction form
    20,611.76/30,920.74 = 7,467.21/x
  3. Step 3: Cross multiply
    20,611.76x = 30,920.74 × 7,467.21
  4. Step 4: Simplify right side
    20,611.76x = 230,891,640.27
  5. Step 5: Solve for x
    x = 230,891,640.27/20,611.76
  6. Step 6: Final answer
    x = 11,201.94

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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.