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Finding the Fourth Proportional to 20,628.56, 30,942.80 and 7,480.88

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Solution

The fourth proportional to 20,628.56, 30,942.80 and 7,480.88 is: 11,221.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628.56 : 30,942.80 = 7,480.88 : x
  2. Step 2: Convert to fraction form
    20,628.56/30,942.80 = 7,480.88/x
  3. Step 3: Cross multiply
    20,628.56x = 30,942.80 × 7,480.88
  4. Step 4: Simplify right side
    20,628.56x = 231,479,373.66
  5. Step 5: Solve for x
    x = 231,479,373.66/20,628.56
  6. Step 6: Final answer
    x = 11,221.31

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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.