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Finding the Fourth Proportional to 20,422.85, 30,634.16 and 7,951.55

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Solution

The fourth proportional to 20,422.85, 30,634.16 and 7,951.55 is: 11,927.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.85 : 30,634.16 = 7,951.55 : x
  2. Step 2: Convert to fraction form
    20,422.85/30,634.16 = 7,951.55/x
  3. Step 3: Cross multiply
    20,422.85x = 30,634.16 × 7,951.55
  4. Step 4: Simplify right side
    20,422.85x = 243,588,968.42
  5. Step 5: Solve for x
    x = 243,588,968.42/20,422.85
  6. Step 6: Final answer
    x = 11,927.28

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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.