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Finding the Fourth Proportional to 6,639.76, 9,965.79 and 3,355.17

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Solution

The fourth proportional to 6,639.76, 9,965.79 and 3,355.17 is: 5,035.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639.76 : 9,965.79 = 3,355.17 : x
  2. Step 2: Convert to fraction form
    6,639.76/9,965.79 = 3,355.17/x
  3. Step 3: Cross multiply
    6,639.76x = 9,965.79 × 3,355.17
  4. Step 4: Simplify right side
    6,639.76x = 33,436,919.63
  5. Step 5: Solve for x
    x = 33,436,919.63/6,639.76
  6. Step 6: Final answer
    x = 5,035.86

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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.