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Finding the Fourth Proportional to 20,636.44, 30,966.95 and 7,489.83

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Solution

The fourth proportional to 20,636.44, 30,966.95 and 7,489.83 is: 11,239.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.44 : 30,966.95 = 7,489.83 : x
  2. Step 2: Convert to fraction form
    20,636.44/30,966.95 = 7,489.83/x
  3. Step 3: Cross multiply
    20,636.44x = 30,966.95 × 7,489.83
  4. Step 4: Simplify right side
    20,636.44x = 231,937,191.12
  5. Step 5: Solve for x
    x = 231,937,191.12/20,636.44
  6. Step 6: Final answer
    x = 11,239.21

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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.