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Finding the Fourth Proportional to 20,491.36, 30,736.86 and 6,640.36

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Solution

The fourth proportional to 20,491.36, 30,736.86 and 6,640.36 is: 9,960.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.36 : 30,736.86 = 6,640.36 : x
  2. Step 2: Convert to fraction form
    20,491.36/30,736.86 = 6,640.36/x
  3. Step 3: Cross multiply
    20,491.36x = 30,736.86 × 6,640.36
  4. Step 4: Simplify right side
    20,491.36x = 204,103,815.67
  5. Step 5: Solve for x
    x = 204,103,815.67/20,491.36
  6. Step 6: Final answer
    x = 9,960.48

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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.