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Finding the Fourth Proportional to 20,635.66, 30,965.79 and 7,489.06

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Solution

The fourth proportional to 20,635.66, 30,965.79 and 7,489.06 is: 11,238.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,635.66 : 30,965.79 = 7,489.06 : x
  2. Step 2: Convert to fraction form
    20,635.66/30,965.79 = 7,489.06/x
  3. Step 3: Cross multiply
    20,635.66x = 30,965.79 × 7,489.06
  4. Step 4: Simplify right side
    20,635.66x = 231,904,609.93
  5. Step 5: Solve for x
    x = 231,904,609.93/20,635.66
  6. Step 6: Final answer
    x = 11,238.05

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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.