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Finding the Fourth Proportional to 20,620.56, 30,930.84 and 7,472.95

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Solution

The fourth proportional to 20,620.56, 30,930.84 and 7,472.95 is: 11,209.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.56 : 30,930.84 = 7,472.95 : x
  2. Step 2: Convert to fraction form
    20,620.56/30,930.84 = 7,472.95/x
  3. Step 3: Cross multiply
    20,620.56x = 30,930.84 × 7,472.95
  4. Step 4: Simplify right side
    20,620.56x = 231,144,620.78
  5. Step 5: Solve for x
    x = 231,144,620.78/20,620.56
  6. Step 6: Final answer
    x = 11,209.43

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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.