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Finding the Fourth Proportional to 20,490.36, 30,735.36 and 6,639.36

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Solution

The fourth proportional to 20,490.36, 30,735.36 and 6,639.36 is: 9,958.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.36 : 30,735.36 = 6,639.36 : x
  2. Step 2: Convert to fraction form
    20,490.36/30,735.36 = 6,639.36/x
  3. Step 3: Cross multiply
    20,490.36x = 30,735.36 × 6,639.36
  4. Step 4: Simplify right side
    20,490.36x = 204,063,119.77
  5. Step 5: Solve for x
    x = 204,063,119.77/20,490.36
  6. Step 6: Final answer
    x = 9,958.98

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.