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Finding the Fourth Proportional to 20,461.25, 30,691.88 and 8,157.89

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Solution

The fourth proportional to 20,461.25, 30,691.88 and 8,157.89 is: 12,236.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,461.25 : 30,691.88 = 8,157.89 : x
  2. Step 2: Convert to fraction form
    20,461.25/30,691.88 = 8,157.89/x
  3. Step 3: Cross multiply
    20,461.25x = 30,691.88 × 8,157.89
  4. Step 4: Simplify right side
    20,461.25x = 250,380,980.93
  5. Step 5: Solve for x
    x = 250,380,980.93/20,461.25
  6. Step 6: Final answer
    x = 12,236.84

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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.