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Finding the Fourth Proportional to 20,641.90, 30,962.84 and 8,321.26

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Solution

The fourth proportional to 20,641.90, 30,962.84 and 8,321.26 is: 12,481.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.90 : 30,962.84 = 8,321.26 : x
  2. Step 2: Convert to fraction form
    20,641.90/30,962.84 = 8,321.26/x
  3. Step 3: Cross multiply
    20,641.90x = 30,962.84 × 8,321.26
  4. Step 4: Simplify right side
    20,641.90x = 257,649,841.98
  5. Step 5: Solve for x
    x = 257,649,841.98/20,641.90
  6. Step 6: Final answer
    x = 12,481.89

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Similar ratio
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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.